Appointments
Postdoc, Los Alamos National Laboratory (Sep. 2024 - present), Mentor: Dr. Hou-Tong Chen
Postdoc, Oak Ridge National Laboratory (Oct. 2023 - Aug. 2024), Mentor: Dr. Kai Xiao and Dr. Alexander A. Puretzky
Postdoc, KAIST (Mar. 2023 - Oct. 2023), Advisor: Prof. Fabian Rotermund
Education
PhD in Physics, Korea Advanced Institute of Science and Technology (KAIST) (2017-2023)
Dissertation: Ultrafast optical coherent control of 2D layered materials with interlayer coupling and vibrations (Advisor: Prof. Fabian Rotermund)
BS in Physics, Pusan National University (PNU) (2011-2017)
Graduated with the highest honor (1 out of 58, GPA: 4.12/4.5)
(Military service, Republic of Korea Marine Corps, Apr. 2012 – Jan. 2014)
Key Skills
Ultrafast optical spectroscopy: Transient absorption/reflection spectroscopy and microscopy
Terahertz (THz) spectroscopy: THz time-domain spectroscopy, THz emisson spectroscopy, optical pump‒THz probe
Nonlinear optical spectroscopy: Nonlinear transmission (NLT), Second harmonic generation
Ultrafast lasers: Home-made optical parametric oscillator (OPO) and NIR/MIR lasers
Static optical spectroscopy: Raman, PL, absorption spectroscopy and microscopy
Scientific software: MATLAB, Mathematica, LaTeX and Origin.
*All my setups are automated using MATLAB codes.
Honors and Awards
Best presentation award (OSK, 2020)
Outstanding teaching assistant award (KAIST, 2020)
National science and engineering undergraduate scholarship (KSAF, 2011-2017)
Professional Activities
Journal Referee for Journal of Optical Society of America B (1), Optics Express (3), Communications Materials (1)
Invited talks
Aug 2023 - Optics and Photonics Congress (OPC), Jeju, South Korea
Jun 2023 - The 14th Asia-Pacific Conference on Near-Field Optics (APNFO), Busan, South Korea
May 2023 - Sejong University, Seminar, Seoul, South Korea
Apr 2023 - Korean Physics Society (KPS) Spring, Daejeon, South Korea
Conference Presentation
8 International conference (5 oral and 3 poster)
[8] Jun 2023 - CLEO, Munich, Germany (oral)
*Title: High-speed acousto-optic modulation at optical communication band by ultrafast laser induced hypersonic vibrational coherence
[7] May 2023 - CLEO, San Jose, USA (oral)
*Title: Ultrafast switching of topological invariants by light-driven interlayer vibrations
[6] Jul 2022 - CLEO-PR, Sapporo, Japan (oral)
*Title: Photoinduced Non-thermal Topological Phase Transition in Bi2Se3 Driven by Coherent Interlayer Vibrations
[5] Dec 2021 - ICAMD, Jeju, South Korea (poster)
*Title: Weak interfacial interactions and hot electron transfer at VSe2-Bi2Se3 van der Waals junction interfaces
[4] Aug 2020 - CLEO-PR, Sydney, Australia (oral, virtual)
*Title: Ultrafast Carrier Dynamics and Interlayer Coupling in 1T-VSe2/Graphene van der Waals Heterostructures
[3] Feb 2020 - SPIE Photonics West, San Francisco, USA (oral)
*Title: Ultrafast hot electron transfer in metallic VSe2/Graphene van der Waals Heterostructures
[2] Dec 2019 - ICAMD, Jeju, South Korea (poster)
*Title: Ultrafast Carrier Dynamics in Metallic Single-layer VSe2 and Graphene Heterostructures
[1] May 2018 - APLS, Xian, China (poster)
*Title: Nonlinear optical characterization of SWCNT saturable absorbers for passive mode-locked near 1 μm
14 Domestic conference (4 oral and 10 poster)
[14] May 2023 - ALTA, Jeju, South Korea (poster)
*Title: Ultrafast switch of topological phases via light-driven strain
[13] Aug 2022 - APPC15, Online, South Korea (oral)
*Title: Probing the coupling between topological states and photoinduced interlayer vibrations by time-resolved THz spectroscopy
[12] Jul 2022 - OPC, Jeju, South Korea (oral)
*Title: Coherent control of optical properties of Bi2Se3 at near-infrared wavelengths through photoinduced interlayer vibrations
[11] May 2022 - ALTA, Jeju, South Korea (poster)
*Title: Optical Property Control in Bi2Se3 with Coherent Interlayer Vibrations at Near-Infrared Wavelengths
[10] Jan 2022 - OSK, Daejeon, South Korea (oral)
*Title: Ultrafast dual-pump and probe spectroscopy for precise interlayer vibration control in Bi2Se3 thin-films
[9] Jul 2021 - OSK, Online, South Korea (poster)
*Title: Ultrafast Interfacial Acoustic Phonons and Carrier Dynamics in VSe2/Bi2Se3 van der Waals Heterostructures
[8] May 2021 - ALTA, Online, South Korea (poster)
*Title: Ultrafast Coherent Control of Interlayer Lattice Dynamics in Layered Bi2Se3
[7] Aug 2020 - ALTA, Online, South Korea (poster)
*Title: Ultrafast interlayer hot electron transfer dynamics in 1T-VSe2/Graphene van der Waals heterostructures
[6] Jul 2020 - OSK, Busan, South Korea (poster)
*Title: Hot electron transfer characteristics in metallic VSe2/graphene van der Waals heterostructures
[5] Oct 2019 - KNS, Goyang, South Korea (oral)
*Title: Ultrafast Carrier Dynamics in Perovskite Solar Cells
[4] May 2019 - ALTA, Jeju, South Korea (poster)
*Title: Pump-probe spectroscopy studies of coherent acoustic phonons in layered two-dimensional materials
[3] Dec 2018 - KAIX, Daejeon, South Korea (poster)
*Title: Ultrafast Laser-induced Coherent Acoustic Phonons in Topological Insulator Bi2Se3
[2] May 2018 - ALTA, Jeju, South Korea (poster)
*Title: Cavity design and analysis for graphene mode-locked Cr:ZnS Mid-IR Laser
[1] Feb 2018 - ALTA, Gwangju, South Korea (poster)
*Title: Mode-locked Yb:KYW laser with single-walled carbon nanotubes at 1 μm