SUMMARY
An adept optical engineering researcher, specialized in optics, photonics, and nanofabrication, with a wealth of experience in diverse microscopy and spectroscopy methods, including super-resolution microscopy, interferometric scattering microscopy, optical microscopy, and spectroscopy. Proficient in photonics and nanofabrication, particularly in the development of Carbon nanotube electron emitters, Graphene-based Infrared sensors, and adjustable Infrared emitters. Driven and collaborative, backed by a strong academic background and an impressive publication record, actively seeking a Ph.D. position to explore novel microscopy, spectroscopy, and image-processing techniques for studying live cells.
EDUCATION
Accumulated GPA: 4.0/4.0
Accumulated GPA: 4.07/4.3
Graduated with Summa Cum Laude
Attended the 2017 winter program and visited Xiang Yang Energy Technology Co., LTD
WORK EXPERIENCE
Graduate Research Assistant
Project: Phase intensity nanoscope opens long-time investigation windows of living matter
- Developed
a super-resolution method operating without photobleaching.
- Using SH-SY5Y cells labeled by Gold nanorods(AuNRs) to detect the actin filament structure inside of the cell, and conducting long-term investigation to monitor cell dynamics.
- The use of AuNRs can allow us to reconstruct the sub-diffraction limit images by capturing images of different polarization angles. AuNR’s anti-symmetric structure yields us distinct responses on its polarization states, which can be localized to the sub-diffraction limit by the FISTA algorithm. Consequently, for the single images we can detect the actin filament structure which is approximately 8nm, and for the long-term images(cell-division movies) we can detect the cell division below 100nm scale.
Project: Soft multimaterial photonic devices for plasmonic super-resolution imaging
- Built
a small Integrated Nanoscopic Correction(mINC) device by using liquid crystal
and soft material with a film polarizer and a film quarter-wave plate for
super-resolution using gold nanorods
- The phase retardation of this device can be tuned by the applied voltage to the liquid crystal and this allows us to acquire the data from different polarization states.
Project: Interferometric Phase Intensity Nanoscopy (iPINE), Revealing Nanostructural Features, Resolves Proximal Nanometer Objects below the Diffraction Limit: Implications in Long-Time Super-Resolution of Biological Dynamics
- Built
an interferometric scattering imaging system(iSCAT) with super-resolution
methods using gold nanorods to detect the nanometer objects and resolve them.
-
Used
a phase intensity module composed of liquid crystal, a quarter-wave plate, and
a linear polarizer to capture the data from different polarization states of
gold nanorods located in below diffraction limit region. This module is
controlled by Labview to apply the voltage to liquid crystal to control the
phase retardation and take images at the same time.
- Used an elliptical Airy pattern and phase intensity peak to extract each gold nanorod’s phase and applyed the FISTA algorithm to deconvolute and reconstruct the images.
Project: Optical tweezer (Current project)
- Used a gold nanorod and optical tweezer to manipulate the cell. (Grant in review)
Researcher
Project: Extraction algorithm of light field Information from multi-focus images
- Developed
a new algorithm to extract the 4D light-field information from a few images
-
Used
the geometric transformation to extract the 4D light-field information from the
images taken at different focal points
- Data extraction without 2D Fourier transformation improves computing time, so we can deal with more data points quickly. Also, this algorithm can extract any form of point spread function, and it allows us to localize the data point into a sub-diffraction limit.
Undergraduate research assistant
Project: A study on the electrical and optical characteristics changes of the single-layer polycrystalline graphene depending upon the strain
- After growing
graphene through the Plasma Enhanced Chemical Vapor Deposition(PECVD),
transferred it to the strain device which was developed by myself.
-
Chose the substrates and the electrodes, optimized
the process, designed the composition of the measuring devices station, and
aligned these altogether
to
develop the strain device
.
- Consequently, completed measurement and analysis of the graphene’s optical characteristics changes depending upon the strain.
Undergraduate research assistant
Project: Making of the Kerr microscope for measuring the magnetic domain of powdered ferromagnetic materials
- To
measure the magnetic domain of powdered ferromagnetic material, collect a red
laser(638nm) reflected from the material with different magnetization
controlled by a programmable DC supply with Copper coil and measure the optical
Kerr effect.
- For the objective sample, made the Co-sputtered film, spin-coated Fe powder solution to make the Fe powder film, and analyzed the physical distribution with the Scanning Electron Microscope(SEM).
Intern
- Conducted training sessions about AFM products theory and practical use as well as participated in an AFM products promotion event.
UNDERGRADUATE PROJECT EXPERIENCE
Project: Making of nano-scale distance measuring sensors for the realization of TERS
-
The purpose of this project is to make
the piezoelectric inchworms and a couple of distance measuring sensors in
nano-scale required to measure the accurate movement of the tip.
-
Operated piezoelectric inchworm
actuators, designed and measured sensors integrated with interferometer and
graphene. Then, measured and applied the electrical characteristics change of
single-layer polycrystalline graphene depending upon the strain.
- Made interferometers and observed the interference pattern change through the charge-coupled devices, computed the movement of these conversely using MATLAB.
Project: Making of a spectrometer to measure the spectrum of a Graphene-based IR LED
- Developed an IR spectrometer with 10 nm
resolution in the spectrum range of 800~1600 nm using Arduino, step motor,
diffraction grating, lenses, and IR detector.
- Scanned the angles through a step motor to measure the intensity with the fact that a diffraction grating makes different angles of diffracted light upon each wavelength and analyzed the spectrum converting the angles back to wavelengths.
Project: Making of a carbon nanotube(CNT) electron emitter for the Field Emission Display(FED)
- Analyzed the electrical characteristic
of CNT that was formed by varying the developing time and etching time which
can be variables of the process.
- Vapor deposition of Ni, which is a catalyst for CNT growing, on the Si wafer through RF sputtering. Spin-coated the positive photoresist(PR) on the wafer, patterned with UV exposure and a mask. Developed with the developing time as the variable and obtained a board with the dot pattern PR cured. After etching Ni with the etching time as the variable and forming the Ni islands, stripped the cured PR and made the CNT through PECVD.
PUBLICATIONS
CONFERENCE PRESENTATION
Do Young Kim(speaker), Guanbo Chai. (2024), Sub-10nm nanoscopic imaging reveals sub-10nm cellular architectures, SPIE Photonics West BiOS 2024 Oral session, San Francisco. California.
AWARDS, SCHOLARSHIPS AND HONORS
VOLUNTARY / EXTRACURRICULAR ACTIVITIES
- Helped filming and editing three experimental performance videos of a Korean contemporary artist Okyoung Noh and exhibited the pieces at Ann Arbor Art Center.
- 32 volunteer service activities such as teaching the youths who suffer socially and economically and providing food to isolated people from the society (Total service hours: 165 h 30 m)
CERTIFICATES & SKILLS
|
PECVD, Ultraviolet(UV)-Visible spectrophotometer, Cyclic
voltammetry, Spin coater, RF sputter, Polarimeter, SEM, AFM, Alpha step,
Optical microscope, UV Exposure unit, Probe station, Oscilloscope,
Function generator, Picoammeter, Nanovoltmeter,
Piezoelectric actuators, Vacuum pump (Rotary pump, Oil diffusion pump),
Ti:Sapphire Laser, Oil-immersion optical microscope, Live-cell imaging uint |
📚 Interferometric Phase Intensity Nanoscopy (iPINE), Revealing Nanostructural Features, Resolves Proximal Nanometer Objects below the Diffraction Limit: Implications in Long-Time Super-Resolution of Biological Dynamics
ACS applied nano materials
(Feb 2024)
📚 Interferometric phase-intensity nanoscopy
SPIE Conference Presentation
(Jan 2024)
📚 Sub-10nm nanoscopic imaging reveals sub-10nm cellular architectures
SPIE Conference Presentation
(Jan 2024)
📚 Phase intensity nanoscope (PINE) opens long-time investigation windows of living matter
Nature Communications
(Jul 2023)
📚 Soft multimaterial photonic devices for plasmonic super-resolution imaging
SPIE Conference Presentation
(Mar 2023)
📚 Extraction algorithm of light field information from multi-focus images
OSK Conference Presentation
(Jul 2022)
Seoul, KR