Dr. Hengky Chandrahalim, Assistant Professor of Electrical Engineering

AFIT Nanofabrication & Characterization Facility Director

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Dr. Hengky Chandrahalim is an Assistant Professor in the Department of Electrical and Computer Engineering at the U.S. Air Force Institute of Technology, as well as the Faculty Director of the AFIT Nanofabrication & Characterization Facility. He received a B.Sc. degree from the Ohio State University, and M.Eng., M.Sc., and Ph.D. degrees from Cornell University, all in Electrical and Computer Engineering. After graduating from Cornell University in 2009, he joined the Micro and Nanosystems Laboratory at ETH Zurich as a postdoctoral fellow. Prior to joining AFIT, Dr. Chandrahalim had a joint appointment as a Research Fellow and Lecturer at the Biomedical Engineering and Electrical Engineering and Computer Science departments at the University of Michigan.

Dr. Chandrahalim is a senior member of the Institute of Electrical and Electronics Engineers (IEEE) and Optica, member of the Acoustical Society of America (ASA), American Physical Society (APS), American Society of Mechanical Engineers (ASME), Society of American Military Engineers (SAME), and Society of Photo-Optical Instrumentation Engineers (SPIE). He is an active reviewer of publications in optics & photonics, RF & microwave systems, acoustics, ultrasonics, frequency control, micro/nanosystems, and sensors & actuators. He has served as the technical program committee member for the Eurosensors 2010-2011, 2014, 2016-2019, IEEE Transducers 2019-2021, IEEE Sensors 2012, 2014-2018, 2020-2021, EIPBN 2021, MNE 2021 conferences, and chair for the Foundation of Nonlinear Optics 2019 (FoNLO’19) conference.

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Education

Ph.D., Electrical and Computer Engineering, Cornell University, Ithaca NY

M.Sc., Electrical and Computer Engineering, Cornell University, Ithaca NY

M.Eng., Electrical and Computer Engineering, Cornell University, Ithaca NY

B.Sc., Electrical and Computer Engineering, The Ohio State University, Columbus OH

Awards

• 2021 Elected Senior Member, Optica

• 2020–2022 National Academies of Sciences, Engineering, and Medicine’s Fellowship as a Research Advisor

• 2020–2021 Strategic Ohio Council for Higher Education (SOCHE) Faculty Excellence Award

• 2020–2021 AFIT Graduate School of Engineering and Management Dean’s Distinguished Teaching Professors Award

• 2020 Semifinalist in the Air Force Spark Tank competition (as an advisor)

• 2019 IEEE NEMS Best Student Paper Finalist (as an advisor)

• 2017 Sentinel of Science Award: Top Reviewers in Physics and Astronomy

• 2016–2017 Sentinel of Science Award: Top Reviewers in Engineering

• 2011 Elected Senior Member, Institute of Electrical and Electronics Engineers (IEEE)

Publications

Journal Publications

• 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 in IEEE Spectrum: "Quantum dot paint could make airframe inspection quick and easy"
  See a report in Nanotechnology Now: "A quantum material-based diagnostic paint to sense problems before structural failure"
  See a report in 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. (* denotes corresponding faculty authors)
  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. (* denotes equal contributions)
  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. (* denotes equal contributions)
  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. (* denotes equal contributions)
  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. (Featured as the cover image)
  DOI: 10.1109/TUFFC.2010.1651

• 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

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

• 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," 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," 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," 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," 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," 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," 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," Conference on Lasers and Electro-Optics (CLEO), 2020, pp. 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," Conference on Lasers and Electro-Optics (CLEO), 2020, pp. 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," 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," IEEE International Conference on Nano/MicroEngineered and Molecular Systems (NEMS), 2019, pp. 80-83. (Finalist for the best student paper award)
  DOI: 10.1109/NEMS.2019.8915630

• Michael T. Dela Cruz, Ling Wang, and Hengky Chandrahalim, "Statistically-designed liquid crystalline molecular cell sensors," 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," Advanced Photonics Congress (APC), 2017, pp. SeM2E.1. (Invited)
  DOI: 10.1364/SENSORS.2017.SeM2E.1

• Hengky Chandrahalim, Stephen C. Rand, and Xudong Fan, "Integration of ultrafast laser-inscribed optical waveguides and renewable ring lasers," Conference on Lasers and Electro-Optics (CLEO), 2017, pp. 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," Conference on Lasers and Electro-Optics (CLEO), 2017, pp. JTh2A.2.
  DOI: 10.1364/CLEO_AT.2017.JTh2A.2

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

• 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," Frontiers in Optics (FIO)/Laser Science (LS) XXXI, 2015, pp. 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," Frontiers in Optics (FIO)/Laser Science (LS) XXIX, 2013, pp. 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," 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," 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," 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," IEEE Sensors Conference, 2010, pp. 2193-2196. (Invited paper)
  DOI: 10.1109/ICSENS.2010.5690603

• Hengky Chandrahalim, Cosmin I. Roman, and Christofer Hierold, "Analytic modeling and piezoresistive detection theory of acoustic resonances in carbon nanotubes," 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," IEEE International Ultrasonics Symposium (IUS), 2009, pp. 1044-1049. (Best Student Paper Award)
  DOI: 10.1109/ULTSYM.2009.5441959
  See a report by 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," 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," 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," 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," 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," 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," International Symposium on the Applications of Ferroelectrics (ISAF) and 2008 Meeting of the Electronics Division of the American Ceramic Society, 2008, pp. 1-2. (Invited)
  DOI: 10.1109/ISAF.2008.4693748

• Hengky Chandrahalim, and Sunil A. Bhave, "Digitally-tunable MEMS filter using mechanically-coupled resonator array," 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," 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," Solid State Sensor, Actuator and Microsystems Workshop (Hilton Head 2006), 2006, pp. 304-307.
  DOI: 10.1.1.125.758

• Dana Weinstein, Hengky Chandrahalim, Lih Feng Cheow, and Sunil A. Bhave, "Dielectrically transduced single-ended to differential MEMS filter," IEEE International Solid-State Circuits Conference (ISSCC), 2006, pp. 318-319.
  DOI: 10.1109/ISSCC.2006.1696170

• Hengky Chandrahalim, Dana Weinstein, Lih Feng Cheow, and Sunil A. Bhave, "Channel-select micromechanical filters using high-κ dielectrically transduced MEMS resonators," 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," IEEE International Ultrasonics Symposium (IUS), 2005, pp. 898-901.
  DOI: 10.1109/ULTSYM.2005.1602995

Patents

• 17/237,128, "Hinged temperature-immune self-referencing Fabry-Pérot cavity sensors"

• 17/136,564, "Method of making temperature-immune self-referencing Fabry-Pérot cavity sensors"

• 17/136,552, "Temperature-immune self-referencing Fabry–Pérot cavity sensors"

• 16/782,608, "Noncontact liquid crystalline broadband optoacoustic sensors"

• 10,942,313, "Temperature-immune self-referencing Fabry–Pérot cavity sensors"

• 8,390,398, "Digitally programmable RF MEMS filters with mechanically coupled resonators"

News

• The Military Engineer 2021: "Simplifying surface inspections with quantum dot technology"

• 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"