Colloquium

Department of Physics & Astronomy

Utilizing optical anti-reflection and electromagnetic vacuum field interference in two-dimensional space

August 8, 2023l Hit 735
Date : October 11, 2023 16:00 ~
Speaker : 서민교 (카이스트 물리학과)
Professor : Prof. Dohun Kim, Prof. Sunghoon Jung, Prof. Yongjoo Baek
Location : 56동105호

Manipulation of electromagnetic field interference plays an essential role in the study of a number of light-matter interactions and nonlinear/quantum optical effects. In this talk, we will discuss the interferential generation of optical anti-reflection and electromagnetic vacuum and its potential to realize new optical field textures or to investigate magneto-optical phenomena and exciton activities in two dimensions. First, resonant extreme anti-reflection based on an optical multilayer structure significantly improves magneto-optic Kerr effect (MOKE) microscopy for an atomically thin magnetic film. High-visibility MOKE microscopy enables real-time measurement and statistical analysis of magnetization reversal events beyond the optical diffraction limit. Second, we implement a unique photonic platform that supports non-trivial optical field textures of ideal anti-reflection singularities corresponding to optical vortices and anti-vortices in two dimensions. The external field-driven phase transition between the trivial and non-trivial topological textures allows the optical vortex and anti-vortex to exhibit dynamical properties analogous to unbounded quasiparticles in other physical entities. Third, we will present a metasurface mirror to tailor optical vacuum field interferences and to tune the radiative decay dynamics of two-dimensional excitons with more optical degrees of freedom.

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