visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
장소 E6 1323 
일시 4pm, 14th April 
연사 신승우 (KAIST 물리학과) 
Title: Holographic tomography of dielectric tensors at optical frequency
 
Speaker: 신승우 (KAIST 물리학과)
 
Date: 4pm, 14th April
 
Place: E6 1323 (Available seats can be limited because of the COVID situation.)
 
Abstract
Ranging from material science to soft matter physics, liquid-crystal displays, and tissue biology, three-dimensional (3D) optically anisotropic structures have been investigated for versatile purposes in various research areas. However, conventional methods indirectly access information of 3D anisotropic structure, due to the lack of direct imaging modality for 3D anisotropy.
 
Optical diffraction tomography (ODT) techniques have been successfully demonstrated in reconstructing 3D refractive index (RI) distribution for various research areas. However, applications of the techniques have been restricted to optically isotropic objects, due to the scalar wave assumption in the ODT principles. This assumption severely limits broader applications of the ODT techniques to optically anisotropic objects, particularly for liquid crystalline materials and filament structures in biological cells.
 
Here, we present dielectric tensor tomography as a label-free modality for reconstructing 3D dielectric tensors of anisotropic structures. Dielectric tensor, a physical descriptor for vectorial light-matter interaction, serves intrinsic information of optical anisotropy including principal refractive indices and optic axes. By measuring diffracted electric fields and inversely solving a vectorial wave equation, the present method offers 3D distributions of dielectric tensors, principal RIs, and optic axes of anisotropic structures. The feasibility of the present method is validated by numerical simulations and experimental results. We demonstrate quantitative tomographic measurements of various nematic liquid-crystal structures and their fast 3D nonequilibrium dynamics.
번호 일시 장소 연사 제목
355 May. 11(Wed), 4pm  E6-2. #1323 & Zoom  Dr. Sunok Josephine Suh (Kavli Institute for Theoretical Physics)  Gravity as a phenomenon in quantum dynamics
354 3pm, 19th May  online  Jonghee Yoon, PhD (Assistant professor, Department of Physics, Ajou University)  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
353 4pm, 10th May  E6 1323  권혁준 (Korea Institute for Advanced Study, KIAS)  (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
352 4pm, 28th April  E6 1323  유경식 (KAIST 전기및전자공학부)  (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
» 4pm, 14th April  E6 1323  신승우 (KAIST 물리학과)  (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
350 4pm, 31th March  online  최현용 (서울대학교 물리천문학부)  (광학분야 특별세미나)Ultrafast time-resolved spectroscopy in topological materials
349 May. 13 (Fri.), 04:00 PM  자연과학동(E6-2) 1st fl. #1323  Dr. Yosep Kim(Center for Quantum Information, KIST)  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
348 May. 13 (Fri.), 02:30 PM  Zoom webinar  Dr. Kun-Rok Jeon(Department of Physics, Chung-Ang University)  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
347 Apr. 13(Wed.) 10:30Am  E6 #1323/zoom  Mingu Kang (Max Planck POSTECH Korea Research Initiative)  Harnessing topology and correlations from singularities in 3d-kagome metals
346 10AM, 31th Mar.  E6 #1501/zoom  Dr. Samuel Begg (APCTP)  Weiss fields for Quantum Spin Dynamics file
345 Apr. 1(Fri.), 04:00 PM  Zoom webinar  Dr. Kayoung Lee (KAIST)  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
344 10AM, 29th Mar. / 13:30 PM, 30th Mar.  E6 #1501/zoom, E6 #2502/zoom  Dr. RYO HANAI (APCTP)  Non-reciprocal phase transitions file
343 Jan. 26th (Tue), 13:00  E6 #1501  Dr. Hyojin Jung (NIMS)  An Introduction to Cohomology groups file
342 Jan. 25th (Tue), 15:00  E6 #1501/online  Junhyun Lee (Rutgers, the State University of New Jersey)  Emulating twisted double bilayer graphene with a multiorbital optical lattice file
341 Jan. 18(Tue), 2pm-3pm  KI bldg. 5th fl. Room B501 & Zoom  YoungJu Jo (Stanford University)  Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
340 Jan. 17(Mon) - 21 (Fri), 2-4pm  E6-2 Room 2502  Dr. Donghui Jeong (Penn State University)  Five Lectures on Observational Probes of Dark Energy file
339 Jan. 11th(Tue), 15:00  E6 #1501  Soyeun Kim(UIUC)  Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
338 Jan 12th (Wed), 11:00 AM  Zoom and E6 #1323  Joonseok Hur (MIT)  Spectroscopic study of trapped ions towards probing dark matter and new physics file
337 Dec. 3 (Fri.), 04:00 PM  Zoom webinar  Dr. Hyejin Jang (Seoul National University)  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
336 Dec. 3 (Fri.), 02:30 PM  Zoom webinar  Dr. Soong-Geun Je(Chonnam National University)  Topological Spin Textures: Skyrmions and Beyond file