Sanghyeon Yu 

Postdoctoral Researcher
Seminar für Angewandte Mathematik
Department of Mathematics
ETH Zurich

Phone: +41 44 632 6965
Email: sanghyeon.yu (at) sam (dot) math (dot) ethz (dot) ch
Address:  HG J 48, Rämistrasse 101, 8092 Zurich, Switzerland


        

I am a postdoctoral researcher at ETH Zurich. 
My advisor is Prof. Habib Ammari.



RESEARCH INTEREST
  • Applied Mathematics, Partial Differential Equations (PDEs), Metamaterials, Wave Propagation, Inverse Problems, Invisibility Cloaking

PUBLICATIONS
  1. H. Ammari, W. Wu and S. Yu, Double-negative electromagnetic metamaterials due to chirality, arXiv:1712.02863.  [Link]
  2. H. Ammari, M. Ruiz, S. Yu and H. Zhang, Reconstructing fine details of small objects by using plasmonic spectroscopic data. Part II: The strong interaction regime, arXiv:1712.02639.  [Link]
  3. H. Ammari, B. Fitzpatrick, H. Lee, S. Yu and H. Zhang, Double-negative acoustic metamaterials, arXiv:1709.08177.  [Link]
  4. H. Ammari, M. Ruiz, S. Yu and H. Zhang, Field expansions for systems of strongly coupled plasmonic nanoparticles, arXiv:1709.08469.  [Link]
  5. H. Kang and S. Yu, Quantitative characterization of stress concentration in the presence of closely spaced hard inclusions in two-dimensional linear elasticity, arXiv:1707.02207.  [Link]
  6. H. Kang and S. Yu, A proof of the Flaherty-Keller formula on the effective property of densely packed elastic composites, arXiv:1707.02205.  [Link]
  7. M. Lim and S. Yu, Stress concentration for two nearly touching circular holes, arXiv:1705.10400.  [Link]
  8. M. Lim and S. Yu, Asymptotic analysis for superfocusing of the electric field in between two nearly touching metallic spheres, arXiv:1412.2464.  [Link]
  9. S. Yu and H. Ammari, Plasmonic interaction between nanospheres, To appear in SIAM Review (Research Spotlights section).  [Link]
  10. H. Ammari, M. Ruiz, S. Yu, and H. Zhang, Reconstructing fine details of small objects by using plasmonic spectroscopic data, To appear in SIAM Journal on Imaging Sciences.  [Link]
  11. H. Ammari, M. Putinar, M. Ruiz, S. Yu and H. Zhang, Shape reconstruction of nanoparticles from their associated plasmonic resonances, To appear in Journal de Mathématiques Pures et Appliquées.  [Link]
  12. H. Ammari, B. Fitzpatrick, H. Lee, S. Yu and H. Zhang, Subwavelength phononic bandgap opening in bubbly media, To appear in Journal of Differential Equations.  [Link]
  13. K. Ando, H. Kang, K. Kim and S. Yu,  Spectrum of Neumann-Poincaré operator on annuli and cloaking by anomalous localized resonance for linear elasticity, To appear in SIAM Journal on Mathematical Analysis.  [Link]
  14. H. Kang, M. Lim and S. Yu, Spectral resolution of the Neumann-Poincaré operator on intersecting disks and analysis of plasmon resonance, Archive for Rational Mechanics and Analysis (ARMA) 226 (2017), 83-115.  [Link]
  15. K. Ando, Y. Ji, H. Kang, K. Kim and S. Yu, Spectral properties of the Neumann-Poincaré operator and cloaking by anomalous localized resonance for the elasto-static system, European Journal of Applied Mathematics (2017). doi:10.1017/S0956792517000080  [Link]
  16. S. Yu and M. Lim, Shielding at a distance due to anomalous resonance, New Journal of Physics 19 (2017), 033018.  [Link]
  17. H. Ammari, M. Ruiz, W. Wu, S. Yu, and H. Zhang, Mathematical and numerical framework for metasurfaces using thin layers of periodically distributed plasmonic nanoparticles, Proceedings of the Royal Society A 472 (2016), 20160445.  [Link]
  18. H. Ammari, M. Ruiz, S. Yu, and H. Zhang, Mathematical analysis of plasmonic resonances for nanoparticles: the full Maxwell equations, Journal of Differential Equations 261 (2016), 3615-3669.  [Link]
  19. H. Kang, K. Kim, H. Lee, J. Shin and S. Yu, Spectral properties of the Neumann-Poincaré operator and uniformity of estimates for the conductivity equation with complex coefficients, Journal of London Mathematical Society (2) 93 (2016), 519-546.  [Link]
  20. M. Lim and S. Yu, Asymptotics of the solution to the conductivity equation in the presence of adjacent circular inclusions with finite conductivities, Journal of Mathematical Analysis and Applications 421 (2015), 131-156.  [Link]
  21. H. Ammari, J. Garnier, H. Kang, M. Lim and S. Yu, Generalized polarization tensors for shape description, Numerische Mathematik 126 (2014), 199-224.  [Link
  22. H. Ammari, H. Kang, H. Lee, M. Lim and S. Yu, Enhancement of near cloaking for the full Maxwell equations, SIAM Journal on Applied Mathematics 73 (2013), 2055-2076.  [Link]
  23. H. Ammari, P. Garapon, F. Jouve, H. Kang, M. Lim, and S. Yu, A new optimal control approach for the reconstruction of extended inclusions, SIAM Journal on Control and Optimization 51 (2013), 1372-1394.  [Link]
  24. M. Lim and S. Yu, Reconstruction of the shape of an inclusion from Elastic Moment Tensors, Contemporary Mathematics 548, 2011.

EDUCATION
  • Ph.D. in Mathematical Sciences, Aug. 2015
    KAIST, Daejeon, Republic of Korea
    - Advisor: Prof. Mikyoung Lim
  • M.S. in Mathematical Sciences, Feb. 2011
    KAIST, Daejeon, Republic of Korea
    Advisor: Prof. Mikyoung Lim
  • B.S. in Physics, Feb. 2009
    Korea Univesity, Republic of Korea

HONOR AND AWARDS
  • National Junior Research Fellowship (2012 - 2015)
    - National Research Foundation of Korea
  • Lotte Foundation Scholarship (2007)
    - Lotte Foundation
  • Outstanding TA Award (Calculus I, 2012 Spring)
    - Department of Mathematical Sciences, KAIST

VISITING EXPERIENCES
  • Ecole Normale Supérieure, Paris, France (Oct. 8 - Oct. 21, 2012)
    Département de mathématiques et applications

  • Columbia University, New York, United States (Sep. 1, 2013 - Jan. 31, 2014)
    Department of Applied Physics and Applied Mathematics

  • Hong Kong University of Science and Technology (HKUST), Hong Kong (Jan. 09 - Jan. 23, 2017)
    Department of Mathematics

  • Radon Institute for Computational and Applied Mathematics (RICAM), Linz, Austria (Mar. 14 - Mar. 17, 2017)

TEACHING  EXPERIENCES

     Teaching Assistant, Department of Mathematical Sciences, KAIST
  • Calculus I, 2012 Spring (Recitation, Grading)
  • Differential Equations and Applications, 2011 Spring (Recitation, Grading)
  • Analysis II, 2011 Fall (Recitation, Grading)
  • Analysis II, 2009 Fall (Recitation)