Single Photon Avalanche Photodetector(SPADs)

Research on advanced optoelectronics devices based on compound semiconductors. I fabricated an optical modulator using an III-V multi-quantum well semiconductor. To make contact, I optimized gold plating for high-frequency data transmission.

I worked on active metasurface. One of the works involved research on flexible metasurface. The metasurface is fabricated using an advanced lithography technique called "atomic layer lithography". I was able to fabricate nanoslits of width as small as ~ 1 nm on top of PET and PDMS substrate. These types of metasurfaces are capable of modulation of incident electromagnetic waves (Thz, Microwave, optical) completely, enabling application in transformative metasurfaces.Along with this… Show more I worked on active metasurface. One of the works involved research on flexible metasurface. The metasurface is fabricated using an advanced lithography technique called "atomic layer lithography". I was able to fabricate nanoslits of width as small as ~ 1 nm on top of PET and PDMS substrate. These types of metasurfaces are capable of modulation of incident electromagnetic waves (Thz, Microwave, optical) completely, enabling application in transformative metasurfaces.Along with this work, I worked on an active surface-enhanced Raman spectroscopy platform. Using the template stripping technique, I fabricated a nanotip array of diameter ranging from 30-50 nm on PET substrate on a wafer scale. We could control SERS activity using external stimuli paving the way for an active SERS platform.I also worked on the ultrathin metal film for optical sensing. We defined a characteristic thickness(related to different physical constants) using which we could achieve maximum electromagnetic absorption of 50% using ultra-thin metal films. The tunability of absorption can lead to high precision optical sensing. Show less

The thesis for my Ph.D. is "Development of zero-nanometer gap technology for electromagnetic wave modulation". During my Ph.D., I worked on topology changing metasurface. A new active metasurface containing an array of slits with a width as small as ~1 nm was fabricated using atomic layer lithography. These metasurfaces are able to control light dynamically, useful for tuning symmetry, and transformation optics. The control of light is due to changes in the width of the slit in the nanometer… Show more The thesis for my Ph.D. is "Development of zero-nanometer gap technology for electromagnetic wave modulation". During my Ph.D., I worked on topology changing metasurface. A new active metasurface containing an array of slits with a width as small as ~1 nm was fabricated using atomic layer lithography. These metasurfaces are able to control light dynamically, useful for tuning symmetry, and transformation optics. The control of light is due to changes in the width of the slit in the nanometer scale, thereby tuning the gap plasmons. Show less

I was a senior research fellow on INDO-Korea project on "growth and characterization of zinc oxide (ZnO) nanowires for various applications". The primary research was to synthesize micrometer-long and aligned ZnO nanowires using a limited-volume heating method. We were able to grow as long as ~5 um nanowires, suitable for gas sensing. The materials were characterized by x-ray diffraction, FESEM imaging, and UV-Vis spectroscopy.