Research

***Postdoctoral Associate positions are available (U.S. citizenship required). Interested candidates should contact Prof. Chandrahalim (hengky(at)microsystems.group) to apply.***

Integrated Optics, Optofluidics, and Optomechanics

• "Multiphoton nanosculpting of optical resonant and non-resonant microsensors on fiber tips," ACS Appl. Mater. Interfaces, 14 (17), 2022, pp. 19988–19999.

• "Demonstration of versatile whispering-gallery micro-lasers for remote refractive index sensing," Opt. Express, 26 (5), 2018, pp. 5800-5809.

• "On-chip, high-sensitivity temperature sensors based on dye-doped solid-state polymer microring lasers," Appl. Phys. Lett., 111 (6), 2017, pp. 061109.

• "Evanescent coupling between refillable ring resonators and laser-inscribed optical waveguides," Appl. Opt., 56 (16), 2017, pp. 4750-4756.

• "Reconfigurable solid-state dye-doped polymer ring resonator lasers," Sci. Rep., 5, (18310), 2015, pp. 1-8.

• "Monolithic optofluidic ring resonator lasers created by femtosecond laser nanofabrication," Lab Chip, 15 (10), 2015, pp. 2335-2340.

Radio Frequency Microelectromechanical Systems

• "Impact of silicon ion irradiation on aluminum nitride-transduced microelectromechanical resonators," Adv. Mater. Interfaces, 10 (32), 2023, pp. 2300240.

• "Effects of gamma ray radiation on the performance of microelectromechanical resonators," Adv. Eng. Mater., 25 (14), 2023, pp. 2201837.

• "Influence of a tailored oxide interface on the quality factor of microelectromechanical resonators," Adv. Mater. Interfaces, 10 (9), 2023, pp. 2202446.

• "PZT transduction of high-overtone contour-mode resonators," IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 57 (9), 2010, pp. 2035-2041.

• "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.

• "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.

• "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.

3D Nanomachining

• "Nonlinear damping as the fourth dimension in optical fiber anemometry," Adv. Sensor Res., 4 (1), 2025, pp. 2400080.

• "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).

• "Multiphoton nanosculpting of optical resonant and non-resonant microsensors on fiber tips," ACS Appl. Mater. Interfaces, 14 (17), 2022, pp. 19988–19999.

• "Three-dimensional Fabry–Pérot cavities sculpted on fiber tips using a multiphoton polymerization process," J. Micromech. Microeng., 30 (12), 2020, pp. 125007.

Soft Matters

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

• "Noncontact liquid crystalline broadband optoacoustic sensors," U.S. Patent No. US11,366,054B2.

• "Liquid crystal-enhanced photophone cells," Conference on Lasers and Electro-Optics (CLEO), 2020, SW4G.6.

• "Free-spaced-coupled liquid crystalline broadband optoacoustic sensors," IEEE International Conference on Nano/MicroEngineered and Molecular Systems (NEMS), 2019, pp. 80-83.

• "Statistically-designed liquid crystalline molecular cell sensors," IEEE International Conference on Nano/MicroEngineered and Molecular Systems (NEMS), 2019, pp. 157-162.

• "Fusion of renewable ring resonator lasers and ultrafast laser inscribed photonic waveguides," Sci. Rep., 6, (32668), 2016, pp. 1-10.

Quantum Engineering

• "Novel quantum dot technology shows promise in simplifying vehicle and structural surface inspections," Exceptional Release Military Journal, 155, 2021, pp. 40-45.

• "Simplifying surface inspections with quantum dot technology," The Military Engineer, 113 (734), 2021, pp. 71-72.

• "Comprehensive optical strain sensing through the use of colloidal quantum dots," ACS Appl. Mater. Interfaces, 12 (39), 2020, pp. 44156-44162.
  See a report on this work in IEEE Spectrum: "Quantum dot paint could make airframe inspection quick and easy"
  See a report on this work in Nanotechnology Now: "A quantum material-based diagnostic paint to sense problems before structural failure"
  See a report on this work in AFIT News: "AFIT student research selected as Spark Tank semi-finalist"

• "Demonstration of on-chip quantum dots microcavity lasers in a molecularly engineered annular groove," Opt. Lett, 44 (3), 2019, pp. 495-498.