Publications

Book Chapters

• Jonathan W. Smith, Jeremiah C. Williams, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, Three-dimensional Fabry–Pérot cavities sculpted on fiber tips using a multiphoton polymerization process, Handbook of Scholarly Publications from the Air Force Institute of Technology (AFIT), Adedeji B. Badiru, Frank W. Ciarallo, and Eric G. Mbonimpa, eds., CRC Press, December 2022, pp. 535-550.
  DOI: 10.1201/9781003220978-33
  

• Cao Dung Truong, Duy Nguyen Thi Hang, Hengky Chandrahalim, and Minh Tuan Trinh, On-chip silicon photonic controllable 2 x 2 four-mode waveguide switch, Handbook of Scholarly Publications from the Air Force Institute of Technology (AFIT), Adedeji B. Badiru, Frank W. Ciarallo, and Eric G. Mbonimpa, eds., CRC Press, December 2022, pp. 513-534.
  DOI: 10.1201/9781003220978-32
  

Journal Publications

• Harris J. Hall, Tyler Grunzke, Samuel Campbell, and Hengky Chandrahalim, "A nonlinear viscoelastic 3D bellows microspring fabricated with two-photon polymerization," Sci. Rep., 16 (31176), 2026, pp. 1-14.
  DOI: 10.1038/s41598-026-57011-5
  

• Jeremiah C. Williams and Hengky Chandrahalim, "Nonlinear damping as the fourth dimension in optical fiber anemometry," Adv. Sensor Res., 4 (1), 2025, pp. 2400080.
  DOI: 10.1002/adsr.202400080
  
• This work is featured on the back cover of Adv. Sensor Res., 4 (1), 2025.
  

• Franck Assogba Onanga and Hengky Chandrahalim, "Optofluidic passive parity-time-symmetric systems," R. Soc. Open Sci., 11 (1), 2024, pp. 231200.
  DOI: 10.1098/rsos.231200
  
• This work is featured on the front cover of R. Soc. Open Sci., 11 (3), 2024.
  

• David D. Lynes, Joshua Young, Eric Lang, and Hengky Chandrahalim, "Impact of silicon ion irradiation on aluminum nitride-transduced microelectromechanical resonators," Adv. Mater. Interfaces, 10 (32), 2023, pp. 2300240.
  DOI: 10.1002/admi.202300240
  
• This work is selected as the 'Editor's Choice' of the issue.
  
• This work is featured on the front cover of Adv. Mater. Interfaces, 10 (32), 2023.
  

• David D. Lynes, Hengky Chandrahalim, James E. Bevins, and James C. Petrosky, "Effects of gamma ray radiation on the performance of microelectromechanical resonators," Adv. Eng. Mater., 25 (14), 2023, pp. 2201837.
  DOI: 10.1002/adem.202201837
  
• This work is featured on the inside back cover of Adv. Eng. Mater., 25 (14), 2023.
  

• David D. Lynes and Hengky Chandrahalim, "Influence of a tailored oxide interface on the quality factor of microelectromechanical resonators," Adv. Mater. Interfaces, 10 (9), 2023, pp. 2202446.
  DOI: 10.1002/admi.202202446
  
• This work is featured on the front cover of Adv. Mater. Interfaces, 10 (9), 2023.
  

• Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, and Nicholas G. Usechak, "Two-photon machining of sensors on fiber tips," Opt. Photonics News, 33 (12), 2022, pp. 54.
  DOI: 10.1364/OPN.33.12.000054
  
• See a report on this work in the Research Outreach Magazine [December 2022]: "Manufacturing on the nanoscale: Optomechanical sensors with multiphoton polymerization"
• See a report on this work in the Research Outreach Magazine [October 2022]: "Two-photon polymerization for advanced sensor manufacturing"
• See a report on this work in the Nanoscribe News [November 2022]: "3D-printed fiber sensors with complex moving parts"

• David D. Lynes, Hengky Chandrahalim, Justin M. Brown, Karanvir Singh, Kyle T. Bodily, and Kevin D. Leedy, "A statistical method to optimize the chemical etching process of zinc oxide thin films," R. Soc. Open Sci., 9 (8), 2022, pp. 211560.
  DOI: 10.1098/rsos.211560
  

• Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, and Nicholas G. Usechak, "Multiphoton nanosculpting of optical resonant and non-resonant microsensors on fiber tips," ACS Appl. Mater. Interfaces, 14 (17), 2022, pp. 19988-19999.
  DOI: 10.1021/acsami.2c01033
  
• This work is featured on the supplementary cover of ACS Appl. Mater. Interfaces, 14 (17), 2022.
  
• See a report on this work in the Research Outreach Magazine [December 2022]: "Manufacturing on the nanoscale: Optomechanical sensors with multiphoton polymerization"
• See a report on this work in the TechLink News: "US Air Force builds microscopic anemometer, just 75 microns"
• See a report on this work in the Nanoscribe News [November 2022]: "3D-printed fiber sensors with complex moving parts"

• Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, and Nicholas G. Usechak, "Two-photon nanomachining of a micromechanically enhanced optical cavity sensor on an optical fiber tip," Adv. Photonics Res., 3 (7), 2022, pp. 2100359 (1-10).
  DOI: 10.1002/adpr.202100359
  
• This work is featured on the inside front cover of Adv. Photonics Res., 3 (7), 2022.
  
• See a report on this work in the Research Outreach Magazine [October 2022]: "Two-photon polymerization for advanced sensor manufacturing"
• See a report on this work in the TechLink News: "Passive microscopic Fabry–Pérot interferometer sensor"
• See a report on this work in the Nanoscribe News [November 2022]: "3D-printed fiber sensors with complex moving parts"

• Michael Sherburne, Candice Mueller, John Brewer, Thomas Weber, and Hengky Chandrahalim, "Novel quantum dot technology shows promise in simplifying vehicle and structural surface inspections," Exceptional Release Military Journal, 155, 2021, pp. 40-45.

• Michael Sherburne, Candice Mueller, Thomas Weber, John Brewer, and Hengky Chandrahalim, "Simplifying surface inspections with quantum dot technology," The Military Engineer, 113 (734), 2021, pp. 71-72.

• Cao Dung Truong, Duy Nguyen Thi Hang, Hengky Chandrahalim, and Minh Tuan Trinh, "On-chip silicon photonic controllable 2 x 2 four-mode waveguide switch," Sci. Rep., 11 (897), 2021, pp. 1-14.
  DOI: 10.1038/s41598-020-80174-8

• Jonathan W. Smith, Jeremiah C. Williams, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, "Three-dimensional Fabry–Pérot cavities sculpted on fiber tips using a multiphoton polymerization process," J. Micromech. Microeng., 30 (12), 2020, pp. 125007.
  DOI: 10.1088/1361-6439/abc0fd
  
• Selected as one of the '2020 Highlight' articles by IOP Science

• Michael D. Sherburne, Candice R. Roberts, John S. Brewer Jr., Thomas E. Weber, Tod V. Laurvick, and Hengky Chandrahalim, "Comprehensive optical strain sensing through the use of colloidal quantum dots," ACS Appl. Mater. Interfaces, 12 (39), 2020, pp. 44156-44162.
  DOI: 10.1021/acsami.0c12110
  
• See a report on this work in the IEEE Spectrum: "Quantum dot paint could make airframe inspection quick and easy"
  
• See a report on this work in the Nanotechnology Now: "A quantum material-based diagnostic paint to sense problems before structural failure"
  
• See a report on this work in the AFIT News: "AFIT student research selected as Spark Tank semi-finalist"

• Cong Chen, Jin Yuan, Lei Wan, Hengky Chandrahalim, Zhenshi Chen, Naoya Nishimura, Harunobu Takeda, Hiroaki Yoshioka, Weiping Liu, Yuji Oki, Xudong Fan, and Zhaohui Li, "Demonstration of on-chip quantum dots microcavity lasers in a molecularly engineered annular groove," Opt. Lett, 44 (3), 2019, pp. 495-498.
  DOI: 10.1364/OL.44.000495

• Lei Wan, Hengky Chandrahalim, Jian Zhou, Zhaohui Li, Cong Chen, Sangha Cho, Hui Zhang, Ting Mei, Huiping Tian, Yuji Oki, Naoya Nishimura, Xudong Fan, and Lingjie Jay Guo, "Demonstration of versatile whispering-gallery micro-lasers for remote refractive index sensing," Opt. Express, 26 (5), 2018, pp. 5800-5809.
  DOI: 10.1364/OE.26.005800

• Cong Chen, Lei Wan, Hengky Chandrahalim, Jian Zhou, Hui Zhang, Sangha Cho, Ting Mei, Hiroaki Yoshioka, Huiping Tian, Naoya Nishimura, Xudong Fan, Lingjie Jay Guo, and Yuji Oki, "Effects of edge inclination angles on whispering-gallery modes in printable wedge microdisk lasers," Opt. Express, 26 (1), 2018, pp. 233-241.
  DOI: 10.1364/OE.26.000233

• Lei Wan, Hengky Chandrahalim, Cong Chen, Qiushu Chen, Ting Mei, Yuji Oki, Naoya Nishimura, Lingjie Jay Guo, and Xudong Fan, "On-chip, high-sensitivity temperature sensors based on dye-doped solid-state polymer microring lasers," Appl. Phys. Lett., 111 (6), 2017, pp. 061109.
  DOI: 10.1063/1.4986825

• Hengky Chandrahalim, Stephen C. Rand, and Xudong Fan, "Evanescent coupling between refillable ring resonators and laser-inscribed optical waveguides," Appl. Opt., 56 (16), 2017, pp. 4750-4756.
  DOI: 10.1364/AO.56.004750

• Hengky Chandrahalim, Stephen C. Rand, and Xudong Fan, "Fusion of renewable ring resonator lasers and ultrafast laser inscribed photonic waveguides," Sci. Rep., 6, (32668), 2016, pp. 1-10.
  DOI: 10.1038/srep32668

• Jeremy Moore, Leopoldo L. Martin, Shai Maayani, Kyu Hyun Kim, Hengky Chandrahalim, Matt Eichenfield, Inocencio R. Martin, and Tal Carmon, "Regular oscillations and random motion of glass microspheres levitated by a single optical beam in air," Opt. Express, 24 (3), 2016, pp. 2850-2857.
  DOI: 10.1364/OE.24.002850

• Hengky Chandrahalim and Xudong Fan, "Reconfigurable solid-state dye-doped polymer ring resonator lasers," Sci. Rep., 5, (18310), 2015, pp. 1-8.
  DOI: 10.1038/srep18310

• Hengky Chandrahalim, Qiushu Chen, Ali A. Said, Mark Dugan, and Xudong Fan, "Monolithic optofluidic ring resonator lasers created by femtosecond laser nanofabrication," Lab Chip, 15 (10), 2015, pp. 2335-2340.
  DOI: 10.1039/c5lc00254k

• Clémentine M. Boutry, Hengky Chandrahalim, Patrick Streit, Michael Schinhammer, Anja C. Hänzi, and Christofer Hierold, "Characterization of miniaturized RLC resonators made of biodegradable materials for wireless implant applications," Sens. Actuators A, Phys., 189, 2013, pp. 344-355.
  DOI: 10.1016/j.sna.2012.08.039

• Clémentine M. Boutry, Hengky Chandrahalim, Patrick Streit, Michael Schinhammer, Anja C. Hänzi, and Christofer Hierold, "Towards biodegradable wireless implants," Philos. Trans. R. Soc. A, 370 (1967), 2012, pp. 2418-2432.
  DOI: 10.1098/rsta.2011.0439

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeffrey S. Pulskamp, and Roger Kaul, "PZT transduction of high-overtone contour-mode resonators," IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 57 (9), 2010, pp. 2035-2041.
  DOI: 10.1109/TUFFC.2010.1651
• This work is featured on the cover of the IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 57 (9), 2010.
• See a report on this work in the PolyTec News

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeff Pulskamp, and Roger Kaul, "A Pb(Zr_0.55Ti_0.45)O₃-transduced fully differential mechanically coupled frequency agile filter," IEEE Electron Device Lett., 30 (12), 2009, pp. 1296- 1298.
  DOI: 10.1109/LED.2009.2034112

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeff Pulskamp, Dan Judy, Roger Kaul, and Madan Dubey, "Performance comparison of Pb(Zr_0.52Ti_0.48)O₃-only and Pb(Zr_0.52Ti_0.48)O₃-on-silicon resonators," Appl. Phys. Lett., 93 (23), 2008, pp. 233504.
  DOI: 10.1063/1.3046717

• Hengky Chandrahalim, Dana Weinstein, Lih Feng Cheow, and Sunil A. Bhave, "High-κ dielectrically transduced MEMS thickness shear mode resonators and tunable channel-select RF filters," Sens. Actuators A, Phys., 136 (2), 2007, pp. 527-539.
  DOI: 10.1016/j.sna.2006.12.007

Conference Publications

• Harris Hall,Tyler Grunzke, Samuel Campbell, and Hengky Chandrahalim, "A nonlinear viscoelastic 3D bellows microspring fabricated with two-photon polymerization," the ASME International Mechanical Engineering Congress and Exposition, 2026, IMECE2026-198101.
  

• Harris Hall,Tyler Grunzke, Samuel Campbell, and Hengky Chandrahalim, "A nonlinear viscoelastic 3D microspring fabricated with two-photon polymerization for integrated optical fiber microsensors," AFRL Discover Symposium 2026, Wright-Patterson Air Force Base, Ohio, 2026.
  

• Hengky Chandrahalim and Jeremiah C. Williams, "Advanced integration of 3D optomechanical sensor microsystems with optical fibers," the IEEE Sensors, 2024, pp. 1-4.
  DOI: 10.1109/SENSORS60989.2024.10784872
• Invited Paper

• David D. Lynes and Hengky Chandrahalim, "Self-referencing MEMS resonator with dual mechanical modes for temperature-independent environmental sensing," the IEEE Sensors, 2024, pp. 1-4.
  DOI: 10.1109/SENSORS60989.2024.10784658

• Jeremiah C. Williams and Hengky Chandrahalim, "Harnessing the fourth dimension through nonlinear damping in optical fiber flow sensing," the IEEE Sensors, 2024, pp. 1-4.
  DOI: 10.1109/SENSORS60989.2024.10785238

• David Lynes, Joshua Young, Eric Lang, and Hengky Chandrahalim, "Impacts of heavy particle irradiation on very high frequency microelectromechanical resonators," the IEEE International Ultrasonics Symposium (IUS), 2023, pp. 1-4.
  DOI: 10.1109/IUS51837.2023.10307562

• David Lynes, Hengky Chandrahalim, James E. Bevins, and James C. Petrosky, "Unfolding the effects of Cobalt-60 irradiation on contour-mode piezoelectric resonators," the IEEE International Ultrasonics Symposium (IUS), 2023, pp. 1-4.
  DOI: 10.1109/IUS51837.2023.10307274

• David Lynes and Hengky Chandrahalim, "Effects of Cobalt-60 irradiation on the performance of AlN-transduced microelectromechanical resonators," the International Conference on Electron, Ion, and Photon Beam Technology and Nanofabrication (EIPBN), 2023, 6C-3.
  

• Jeremiah Williams and Hengky Chandrahalim, "Micromechanically assisted refractive index cavity sensor on an optical fiber tip," the International Conference on Micro and Nano Engineering-Eurosensors (MNE-ES), 2022.
  

• David Lynes, Hengky Chandrahalim, Justin Brown, Karanvir Singh, Kyle Bodily, and Kevin Leedy, "Statistically enhanced etching process of Zinc Oxide thin films," the International Conference on Micro and Nano Engineering-Eurosensors (MNE-ES), 2022.
  

• Jeremiah C. Williams and Hengky Chandrahalim, "A fiber tip refractive index sensor featuring a dynamic micromirror," the Optical Sensors and Sensing Congress, 2022, JW2A.53.
  DOI: 10.1364/3D.2022.JW2A.53

• Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, and Nicholas G. Usechak, "A microturbine flow sensor created on an optical fiber tip using multiphoton nanomachining process," the Optical Sensors and Sensing Congress, 2022, SM1C.4.
  DOI: 10.1364/SENSORS.2022.SM1C.4
• One of the top 20 best contributed papers in the 2022 OPTICA Optical Sensors Conference

• Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, and Nicholas G. Usechak, "A microscale flow sensor sculpted on a fiber tip by multiphoton polymerization process," the International Conference on Electron, Ion, and Photon Beam Technology and Nanofabrication (EIPBN), 2022, 10C-1.
  

• Hengky Chandrahalim, Jeremiah C. Williams, Jonathan W Smith, Joseph S. Suelzer, and Nicholas G. Usechak, "Micromechanically enabled microcavity on optical fiber tips," the IEEE Research and Applications of Photonics in Defense Conference (RAPID), 2021, pp. 1-2.
  DOI: 10.1109/RAPID51799.2021.9521446
• Invited Paper

• Jeremiah C. Williams, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, "Optical fiber-tip pressure sensors featuring a spring body and multipositional Fabry–Pérot cavity resonator," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2021, pp. 382-385.
  DOI: 10.1109/MEMS51782.2021.9375301

• Jeremiah C. Williams, Jonathan W. Smith, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, "Optical fiber-tip heat sensor featuring a multipositional Fabry–Pérot cavity resonator," the IEEE Sensors Conference, 2020, pp. 1-4.
  DOI: 10.1109/SENSORS47125.2020.9278730

• Jeremiah C. Williams, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, "Optical fiber tip micro anemometer," the IEEE Sensors Conference, 2020, pp. 1-4.
  DOI: 10.1109/SENSORS47125.2020.9278804

• Michael D. Sherburne, Candice R. Roberts, John S. Brewer Jr., Thomas E. Weber, Tod V. Laurvick, and Hengky Chandrahalim, "Strain sensing using colloidal quantum dots integrated with epoxy," the IEEE Sensors Conference, 2020, pp. 1-4.
  DOI: 10.1109/SENSORS47125.2020.9278933

• Israel Dunk and Hengky Chandrahalim, "Microelectromechanical phase detectors for phase-locked loop applications," the IEEE Sensors Conference, 2020, pp. 1-4.
  DOI: 10.1109/SENSORS47125.2020.9278810

• Matthew Vincie, Tod Laurvick, Hengky Chandrahalim, Richard Cobb, and James Sattler, "Avoiding transients in low-level sensing of secondary electron yield," the IEEE Sensors Conference, 2020, pp. 1-4.
  DOI: 10.1109/SENSORS47125.2020.9278865

• Michael T. Dela Cruz, Ling Wang, and Hengky Chandrahalim, "Liquid crystal-enhanced photophone cells," the Conference on Lasers and Electro-Optics (CLEO), 2020, SW4G.6.
  DOI: 10.1364/CLEO_SI.2020.SW4G.6

• Jonathan W. Smith, Jeremiah C. Williams, Joseph S. Suelzer, Nicholas G. Usechak, and Hengky Chandrahalim, "3-D optical cavities created using local light-triggered polymerization on fiber tips," the Conference on Lasers and Electro-Optics (CLEO), 2020, ATu3K.6.
  DOI: 10.1364/CLEO_AT.2020.ATu3K.6

• Jonathan W. Smith, Joe S. Suelzer, Nicholas G. Usechak, Vincent P. Tondiglia, and Hengky Chandrahalim, "3-D Thermal radiation sensors on optical fiber tips fabricated using ultrashort laser pulses," the International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers’19), 2019, pp. 649-652.
  DOI: 10.1109/TRANSDUCERS.2019.8808673

• Michael T. Dela Cruz, Ling Wang, and Hengky Chandrahalim, "Free-spaced-coupled liquid crystalline broadband optoacoustic sensors," the IEEE International Conference on Nano/MicroEngineered and Molecular Systems (NEMS), 2019, pp. 80-83.
  DOI: 10.1109/NEMS.2019.8915630
• Finalist for the best student paper award
• See a report on this work in the TechLink News: "Air Force scientists develop liquid crystal optoacoustic sensors, non-contact testing applications"

• Michael T. Dela Cruz, Ling Wang, and Hengky Chandrahalim, "Statistically-designed liquid crystalline molecular cell sensors," the IEEE International Conference on Nano/MicroEngineered and Molecular Systems (NEMS), 2019, pp. 157-162.
  DOI: 10.1109/NEMS.2019.8915656

• Hengky Chandrahalim and Xudong Fan, "Hybrid fabrication techniques of 3-D integrated microlaser sensors," the Advanced Photonics Congress (APC), 2017, SeM2E.1.
  DOI: 10.1364/SENSORS.2017.SeM2E.1
• Invited Paper

• Hengky Chandrahalim, Stephen C. Rand, and Xudong Fan, "Integration of ultrafast laser-inscribed optical waveguides and renewable ring lasers," the Conference on Lasers and Electro-Optics (CLEO), 2017, AW4B.5.
  DOI: 10.1364/CLEO_AT.2017.AW4B.5

• Hengky Chandrahalim, Stephen C. Rand, and Xudong Fan, "Refillable and reconfigurable dye-doped ring lasers," the Conference on Lasers and Electro-Optics (CLEO), 2017, JTh2A.2.
  DOI: 10.1364/CLEO_AT.2017.JTh2A.2

• Hengky Chandrahalim and Xudong Fan, "Monolithically integrated ring resonator systems on-chip," the Conference on Lasers and Electro-Optics (CLEO), 2017, JTh4M.1.
  DOI: 10.1364/CLEO_AT.2017.JTh4M.1
• Invited Paper

• Hengky Chandrahalim, Qiushu Chen, Ali A. Said, Mark Dugan, Philippe Bado, and Xudong Fan, "Optofluidic ring cavity lasers fabricated by 3-D femtosecond laser writing technology," the Frontiers in Optics (FIO)/Laser Science (LS) XXXI, 2015, JTu4A.64.
  DOI: 10.1364/FIO.2015.JTu4A.64

• Jeremy Moore, Leopoldo Martin, Kyu Hyun Kim, Hengky Chandrahalim, Matt Eichenfield Inocencio Martin, and Tal Carmon, "Clustering of aerosols in a single potential-well trap," the Frontiers in Optics (FIO)/Laser Science (LS) XXIX, 2013, FTh1D.2.
  DOI: 10.1364/FIO.2013.FTh1D.2

• Clémentine M. Boutry, Hengky Chandrahalim, and Christofer Hierold, "RF conductivity of biodegradable conductive polymers used for a new generation of partially/fully resorbable wireless implantable sensors," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2012, pp. 468-471.
  DOI: 10.1109/MEMSYS.2012.6170226

• Clémentine M. Boutry, Hengky Chandrahalim, and Christofer Hierold, "Characterization of RF resonators made of biodegradable materials for biosensing applications," the Procedia Engineering (Eurosensors XXV), 25, 2011, pp. 1529- 1532.
  DOI: 10.1016/j.proeng.2011.12.378

• Clémentine M. Boutry, Wei Sun, Tobias Strunz, Hengky Chandrahalim, and Christofer Hierold, "Development and characterization of biodegradable conductive polymers for the next generation of RF bio-resonators," the IEEE International Frequency Control Symposium (IFCS), 2010, pp. 258-261.
  DOI: 10.1109/FREQ.2010.5556332

• Ronald G. Polcawich, Jeffrey S. Pulskamp, Sarah Bedair, Gabriel Smith, Roger Kaul, Chris Kroninger, Eric Wetzel, Hengky Chandrahalim, and Sunil A. Bhave, "Integrated PiezoMEMS actuators and sensors," the IEEE Sensors Conference, 2010, pp. 2193-2196.
  DOI: 10.1109/ICSENS.2010.5690603
• Invited Paper

• Hengky Chandrahalim, Cosmin I. Roman, and Christofer Hierold, "Analytic modeling and piezoresistive detection theory of acoustic resonances in carbon nanotubes," the IEEE International Conference on Nanotechnology (NANO), 2010, pp. 778- 781.
  DOI: 10.1109/NANO.2010.5697820

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeff Pulskamp, Babak Pourat, Sebastian Boedecker, and Christian Rembe, "Heterodyne laser-Doppler interferometric characterization of contour-mode resonators above 1 GHz," the IEEE International Ultrasonics Symposium (IUS), 2009, pp. 1044-1049.
  DOI: 10.1109/ULTSYM.2009.5441959
  
• Best Student Paper Award
• See a report on this work in the PolyTec News

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeffrey Pulskamp, and Roger Kaul, "PZT transduced high-overtone width-extensional resonators above 1 GHz," the IEEE International Ultrasonics Symposium (IUS), 2009, pp. 2145-2148.
  DOI: 10.1109/ULTSYM.2009.5441468

• Kuan-Lin Chen, Hengky Chandrahalim, Andrew B. Graham, Sunil A. Bhave, Roger T. Howe, and Thomas W. Kenny, "Epitaxial silicon microshell vacuum-encapsulated CMOS-compatible 200 MHz bulk-mode resonator," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2009, pp. 23-26.
  DOI: 10.1109/MEMSYS.2009.4805309

• Jeff S. Pulskamp, Dan C. Judy, Ronald G. Polcawich, Roger Kaul, Hengky Chandrahalim, and Sunil A. Bhave, "Monolithically integrated piezoMEMS SP2T switch and contour-mode filters," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2009, pp. 900-903.
  DOI: 10.1109/MEMSYS.2009.4805529

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeff Pulskamp, Dan Judy, Roger Kaul, and Madan Dubey, "Fully-differential mechanically-coupled PZT-on-silicon filters," the IEEE International Ultrasonics Symposium (IUS), 2008, pp. 713-716.
  DOI: 10.1109/ULTSYM.2008.0170

• Hengky Chandrahalim, Sunil A. Bhave, Ronald G. Polcawich, Jeff Pulskamp, Dan Judy, Roger Kaul, and Madan Dubey, "Influence of silicon on quality factor, motional impedance and tuning range of PZT-transduced resonators," the Solid State Sensor, Actuator and Microsystems Workshop (Hilton Head 2008), 2008, pp. 360-363.
  DOI: 10.31438/trf.hh2008.93

• Ronald G. Polcawich, Jeff Pulskamp, Dan Judy, Roger Kaul, Madan Dubey, Hengky Chandrahalim, and Sunil A. Bhave, "PZT thin films for RF MEMS applications," the International Symposium on the Applications of Ferroelectrics (ISAF) and 2008 Meeting of the Electronics Division of the American Ceramic Society, 2008, pp. 1-2.
  DOI: 10.1109/ISAF.2008.4693748
• Invited Paper

• Hengky Chandrahalim, and Sunil A. Bhave, "Digitally-tunable MEMS filter using mechanically-coupled resonator array," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2008, pp. 1020-1023.
  DOI: 10.1109/MEMSYS.2008.4443832

• Hengky Chandrahalim, Sunil A. Bhave, Emmanuel Quevy, and Roger T. Howe, "Aqueous transduction of poly-SiGe disk resonators," the International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers’07), 2007, pp. 313-316.
  DOI: 10.1109/SENSOR.2007.4300131

• Lih Feng Cheow, Hengky Chandrahalim, and Sunil A. Bhave, "MEMS filter with voltage-tunable center frequency and bandwidth," the Solid State Sensor, Actuator and Microsystems Workshop (Hilton Head 2006), 2006, pp. 304-307.
  DOI: 10.1109/ISSCC.2006.1696170

• Dana Weinstein, Hengky Chandrahalim, Lih Feng Cheow, and Sunil A. Bhave, "Dielectrically transduced single-ended to differential MEMS filter," the IEEE International Solid-State Circuits Conference (ISSCC), 2006, pp. 318-319.
  DOI: 10.31438/trf.hh2006.78

• Hengky Chandrahalim, Dana Weinstein, Lih Feng Cheow, and Sunil A. Bhave, "Channel-select micromechanical filters using high-κ dielectrically transduced MEMS resonators," the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2006, pp. 894-897.
  DOI: 10.1109/MEMSYS.2006.1627944

• Hengky Chandrahalim, Dana Weinstein, Lih Feng Cheow, and Sunil A. Bhave, "Thickness shear mode vibrations in silicon bar resonators," the IEEE International Ultrasonics Symposium (IUS), 2005, pp. 898-901.
  DOI: 10.1109/ULTSYM.2005.1602995

Press Releases

• Department of the Air Force Technology Transfer and Transition News, August 2026: " Innovation in microelectromechanical components reduces electronics power use"

• Department of the Air Force Technology Transfer and Transition News, May 2026: " Contact-free Sensor Bypasses Traditional Limitations"

• AFIT News, May 2026: " AFIT Chancellor's Award Winners"

• Department of the Air Force Technology Transfer and Transition News, January 2026: " AFIT professor sizing down and revolutionizing the world of microscale optomechanical sensors"

• Department of the Air Force Technology Transfer and Transition News, December 2025: " AFIT professor's invention makes a splash in world of optical devices"

• AFIT News, August 2025: " AFIT Associate Professor's Innovative Work Recognized"

• Featured on the back cover of Adv. Sensor Res., 4 (1), 2025: "Nonlinear damping as the fourth dimension in optical fiber anemometry"

• Featured on the front cover of R. Soc. Open Sci., 11 (3), 2024: "Optofluidic passive parity-time-symmetric systems"

• Featured on the front cover of Adv. Mater. Interfaces, 10 (32), 2023: "Impact of silicon ion irradiation on aluminum nitride-transduced microelectromechanical resonators"

• The U.S. Department of Defense News, October 2023: "Low-cost, three-patent breakthrough is more than meets the eye"

• The 'Editor's Choice' of Advanced Materials Interfaces, August 2023: "Impact of silicon ion irradiation on aluminum nitride-transduced microelectromechanical resonators"

• Featured on the inside back cover of Adv. Eng. Mater., 25 (14), 2023: "Effects of gamma ray radiation on the performance of microelectromechanical resonators"

• AFIT News, May 2023: " AFIT professor named AETC Outstanding Airman of the Year"

• Maxwell Air Force Base News, April 2023: "Air University celebrates its 2022 annual award winners"

• Featured on the front cover of Adv. Mater. Interfaces, 10 (9), 2023: "Influence of a tailored oxide interface on the quality factor of microelectromechanical resonators"

• Research Outreach Magazine, December 2022: "Manufacturing on the nanoscale: Optomechanical sensors with multiphoton polymerization"

• Optics & Photonics News Magazine, December 2022: "One of the top 30 breakthrough stories in optics in 2022"

• Nanoscribe News, November 2022: "3D-printed fiber sensors with complex moving parts"

• AFIT News, October 2022: "Faculty Receives 2022 SASE Professional Achievement Award"

• Research Outreach Magazine, October 2022: "Two-photon polymerization for advanced sensor manufacturing"

• Featured on the cover of Adv. Photonics Res., 3 (7), 2022: "Two-photon nanomachining of a micromechanically enhanced optical cavity sensor on an optical fiber tip"

• TechLink News, 2022: "Air Force scientists develop liquid crystal optoacoustic sensors, non-contact testing applications"

• Featured on the cover of ACS Appl. Mater. Interfaces, 14 (17), 2022: "Multiphoton nanosculpting of optical resonant and non-resonant microsensors on fiber tips"

• TechLink News, 2021: "US Air Force builds microscopic anemometer, just 75 microns"

• AFIT News February, 2021: "Faculty and staff receive SOCHE Excellence Awards"

• TechLink News, 2021: "Passive microscopic Fabry–Pérot interferometer sensor"

• AFIT News, January 2021: "GSEM presents annual awards with ceremony"

• IEEE Spectrum, 2020: "Quantum dot paint could make airframe inspection quick and easy"

• Nanotechnology Now, 2020: "A quantum material-based diagnostic paint to sense problems before structural failure"

• AFIT News, December 2020: "AFIT student research selected as Spark Tank semi-finalist"

• IOP Science, 2020: "Selected as one of the '2020 Highlight' articles"

• PolyTec News, 2010: "Beyond 1 GHz with the New UHF-120 Ultra-High Frequency Vibrometer"