Metasurfaces have attracted much attention as fascinating optical elements because of flat and ultrathin subwavelength structures that manipulate the phase, amplitude, and polarization of an incident light. In contrast to conventional optical elements, metasurfaces provide abrupt phase changes of an incident light, which enable metasurfaces to have a unique functionality to form an arbitral wavefront of a light beam, for example, beam shaping, polarization control, ultrathin lens, and holography.
We investigated a switchable metasurface for lens and hologram. Also we investigated functionalized metasurface for adaptive optics.
The perfect confinement of the light in the finite structure by balancing the electromagnetic fields of the radiative mode.
See papers in many journals.
Topological insulators, which are insulating in the bulk region while conductive along the edge, have been intensively studied due to their intriguing physical properties as well as potential applications. As an optical counterpart of the topological insulators in condensed matter physics, photonic topological insulators (PTIs) show unique characteristics, for example, the guided modes along the edge or interface of PTIs, which are robust against defects and deformations due to topological protection.
We investigated PTIs with conventional photonic crystal slab structure which provides large bandwidth without Berry curvatures.
Confinement and manipulation of light in microcavities is important for a wide range of research areas and applications, e.g., cavity quantum electrodynamics or novel light sources in photonic integrated circuits. The confinement of light could be achieved by photonic bandgap effect in photonic crystal, which is periodic arrangement of dielectric media.
We have utilized defect or discontinuity of arrangement and air-hole shape to achieve strong light confinement. We also developed a subwavelength semiconductor photonic crystal laser which can be fabricated using electron-beam lithography and dry etching. Subwavelength laser sources are potentially useful for nanophotonic circuits, on-chip optical interconnects, and pinpoint-accuracy biochemical sensing.
Unlike conventional lasers that utilize mirrors or periodic structures to trap light, random lasers rely on the multiple scattering of light in disordered media for optical feedback and light confinement. Especially, photonic amorphous media with short-range structural order can significantly improve photonic properties, leading to unique applications. We presented experimental and numerical studies on lasing in polycrystalline and amorphous photonic structures which have no significant photonic bandgap effect.
A major limitation to device applications of random lasers is the lack of control and reproducibility of the lasing modes, namely, the frequencies and spatial locations of lasing modes are unpredictable, varying randomly from sample to sample. Unlike periodic or quasi-periodic structure, deterministic aperiodic structures (DAS) lack both translational and rotational symmetries. Different from random structures, deterministic aperiodic structures are defined by the iteration of simple mathematical rules, rooted in symbolic dynamics and prime number theory, which possess very rich spectral features. We anticipate that the study of lasing in pseudo-random DAS can result in the engineering of multi-frequency coherent light sources suitable for planar integration with photonic chips.
Surface plasmon (SP) modes have attracted the interest of many researchers in the nano-optics field because of their extremely strong field confinement beyond the diffraction limit. In recent years, various plasmonic devices based on SP modes, such as subwavelength lasers, compact waveguides, and biosensors, have been widely investigated because of their ultrasmall mode volume V and relatively high quality factor. In particular, one of the major studies on SP phenomena is about the enhancement of spontaneous emission rate because of the strong ripple effect of SP modes in light-emitting devices.
We investigate the light emitting diode for our living life such as lightning, display, et. al. By optimizing nano pattern embeded LED, emitted light is efficiently extracted from the LED device.
(한국연구재단) 위상학적 복합 결함 구조를 이용한 빛 궤도 각운동량 제어(2025.09 ~ 2028.08) 중견연구-창의연구
(한국연구재단) 고에너지 효율의 1.6Tbps급 멀티모드 광송신 모듈 개발(2025.06 ~ 2027.12) 차세대광패키징기술개발사업 (공동-옵티시스(주))
(한국연구재단) 양자 광학계의 양자광원 기반 양자보안통신 및 양자이미징 핵심기술 개발(2024.07 ~ 2027. 06) 국제협력 네트워크 전략강화사업 (위탁-한국표준과학연구원)
(반도체특성화대학사업) 디지털 광링크용 발광소자 VCSEL의 특성 평가(2025.05 ~ 2025.12) 기업협업프로젝트 (옵티시스(주) 협업)
(모빌리티소부장사업본부) 자율주행 농기계용 보급형 소형 라이다 센서 광원 기술 개발 (2024.07~2025.02) 첨단센서융합디바이사업단 산업전환지원(애로기술)과제
(충남연구원) 디스플레이 난제해결을 위한 대학 중점연구소 기획 (2023.08 ~ 2024.01) 기획과제
(중소벤처기업부) 양면태양전지 기반 집광모듈 개발과 고집적 이동식 소형 발전시스템 (2022.04 ~ 2024.03) 창업성장-기술개발사업, 전략형(위탁-(주)유사이언스)
(중소벤처기업부) LD기반 방역 조명체와 실시간 모니터링 살균 시스템 개발 (2021.09 ~ 2023.08) 현장수요형-기술개발사업 (위탁-(주)유사이언스)
(연구용역) SWIR 초분광광학계 및 할로겐 균일조명 설계 (2021-06-14 ~ 2021-12-31) (주)오즈레이
(중소벤처기업부) NIR 패턴 레이저 기반 HD급 정맥 파인더 개발 (2020.06 ~ 2022.05) 산학연 Collabo R&D 사업화연구 (참여기업- (주)유사이언스)
(한국연구재단) 연속 광방사 대역에서 무한 품위값을 갖는 광속박 상태에 관한 연구 (2020.03 ~ 2023.02) 중견연구자지원사업 - 핵심
(중소벤처기업부) Grating 구조 설계 및 광특성 분석 장치 개발 (2019.06 ~ 2021. 06) 창업성장-기술개발사업 (위탁-(주)유사이언스)
(중소벤처기업부) NIR 패턴 레이저 기반 HD급 정맥 파인더 개발 (2019.06 ~ 2020. 02) 산학연 Collabo R&D 예비연구 (참여기업- (주)유사이언스)
(한국연구재단) 메타 표면을 이용한 광 위상 절연체에 관한 연구 (2017.03 ~ 2020.02) 중견연구자지원사업 - 핵심
(중소벤처기업부) Grating 구조체 설계 및 시뮬레이션 평가 (2018.06 ~ 2019.06) 창업성장-기술개발사업 (위탁-유사이언스)
(한국연구재단) 전류 주입 자연모방 랜덤 레이저 (2013.12 ~ 2016.11) 일반연구자지원사업-기본-모험
(중소기업청) 산업재의 접착공정 품질검사용 UV 조사기 개발 (2015.06 ~ 2016.05) 첫걸음 (참여기업 - 씨엔에이치반도체(주))
(광주과기원) Ag 나노막대 기판에서의 SERS 신호 증감 기작에 관한 분석 (2014.11 ~ 2015.07) 연구용역
(산학협동재단) 야외 환경에서 운용 가능한 빔 확장형 광 커넥터 개발 (2014.06~2015.05) 신진교수 연구비 (매칭과제-쓰리엠시스템)
(한국연구재단) 나노막대 배열 능동 광소자 개발 (2013.09 ~ 2013.10) 일반연구자지원사업-신진-유형2
(한국연구재단) 색구조를 모방한 비결정구조 광소자 개발 (2011.05~2014.04) 일반연구자지원사업-신진-연구비지원
(한국연구재단) 준주기 나노 레이저 개발 (2010.09~2013.08) 일반연구자지원사업-기본-모험
(인하대학교) 랜덤 레이저 구현 및 O-PCB 광직접 회로 기판 응용 (2011.05~2012.02) 선도연구센터육성사업(ACE)-위탁
(인하대학교) 광집적 회로의 광원을 위한 랜덤 레이저 개발 (2010.03 ~ 2010.08, 2010.10 ~ 2011.02) 선도연구센터육성사업(ACE)-위탁