Imperial College London

DrSang SoonOh

Faculty of Natural SciencesDepartment of Physics

Visiting Researcher
 
 
 
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Contact

 

s.oh Website

 
 
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Location

 

901Blackett LaboratorySouth Kensington Campus

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Summary

 

Overview

My research has mainly focused on the theoretical and computational study of the electromagnetic properties of photonic crystals (PhCs), metamaterials, and optical nanostructures. In particular, I have worked in the fields of chiral metamaterials [1], microwave and infrared PhC filters [2] and the self-collimation of spoof surface plasmons [3].

SELF-ASSEMBLED CHIRAL METAMATERIAL

My current work on metamaterials focuses on optical chirality exhibited by self-assembled gyroid metamaterials and THz chiral metamaterials. Together with colleagues at Imperial College, I have recently published two relevant articles, one on an analytical model describing optical chirality, termed tri-helical model [4], and another on the origin of chirality in nanoplasmonic gyroid metamaterials [1]. In the latter work, the transverse and longitudinal modes of the metallic gyroid were fully analysed using band structure calculations and the origin of chirality in a single gyroid was explored to elucidate why these structures exhibit weaker chirality than anticipated. A third article on the tuning of the gyroid’s optical properties is in preparation in collaboration with Prof. Jeremy Baumberg at Cambridge University. With regards to THz metamaterials, I am currently writing an article on achieving strong chiral metamaterials via field localization in collaboration with Prof. Bumki Min at KAIST.

ACTIVE CHIRAL METAMATERIAL

I plan to investigate several key problems in the field of active metamaterials: the fundamental mechanism of chirality in active chiral system and switching of optical properties (chirality, refractive index) using graphene. This work builds on my previous studies of chiral metamaterials and photonic crystals. In addition, the methodology and numerical tools used in these works, for example, the parameter retrieval technique and the FDTD method, are directly applicable to the research on magnetic metamaterials and the design of near-field manipulation devices.


[1] Sang Soon Oh, Angela Demetriadou, Sebastian Wuestner and Ortwin Hess, “On the Origin of Chirality in Nanoplasmonic Gyroid Metamaterials,” Advanced Materials, vol. 25, 612, 2013
[2] Sang Soon Oh, Chul-SikKee, Jae-Eun Kim, Hae Yong Park, Tae Il Kim, Ikmo Park, and H. Lim, “Duplexer Using Microwave Photonic Band Gap Structure,” Appl. Phys. Lett., vol. 76, 2301, 2000
[3] Sang Soon Oh, Sun-Goo Lee, Jae-Eun Kim, Hae Yong Park, “Self-collimation phenomena of surface waves in structured perfect electric conductors and metal surfaces,” Optics Express, vol. 15, 1205, 2007
[4] Angela Demetriadou, Sang Soon Oh, Sebastian Wuestner and Ortwin Hess, “A Tri-helical model for nanoplasmonic gyroid metamaterials,” New Journal of Physics, vol. 14, 083032, 2012

Collaborators

Professor Jeremy J. BaumbergProfessor Ullich Steiner, University of Cambridge, Self-assembled chiral metamaterial, 2012

Dr. Chul-Sik Kee, Gwangju Institute of Science and Technology , Advanced Photonic Research Institute, Surface waves on 2D corrugated metal surface, 2012

Professor Bumki Min, Dr. Teun-Teun Kim, Korea Advanced Institute of Science and Technology, Chiral metamaterial with strong optical activity, 2012