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User:Coh

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Chulwoo "Fingers" Oh
Chulwoo "Fingers" Oh

Contact Information for Chulwoo Oh

Office: Monteith Research Center, Rm# 412
Email: coh@ncsu.edu
Phone: 919-946-0515

Curriculum Vitae: PDF Format (updated on December 2009)

Research Interests

Nanoelectronics and Photonics

  • Displays (including LCDs, OLEDs, Flexible displays)
  • Optical communications
  • Polarimetry and imaging applications
  • Holography (including advanced lithography)
  • Liquid crystal devices
  • Organic electronics
  • Diffractive optical elements
  • Numerical modeling and computation


Dissertation Research

  • Liquid Crystal Polarization Gratings for Photonics Applications
Funded by National Science Foundation (2006-2009)
Study on fundamentals and limits of the polarization grating (PG) diffraction via analytical and numerical methods and develop fabrication processes for high-quality PGs using liquid crystal and related technologies for various photonics applications.
  • Polymer Polarization Gratings For Liquid Crystal Microdisplay
Funded by ImagineOptix Corp. (2008-2009)
Develop microdisplay systems based on polymer polarization gratings with double the brightness as polarizer-based displays and construct prototype pro jectors using standard LC microdisplays. Consult commercialization partners to develop the fabrication process and prototype projectors.
  • Wide-Angle Nonmechanical Beam Steering Development
Funded by US Air Force Research Laboratories with Boulder Nonlinear Systems (2007-2009)
Develop nonmechanical beam steering systems using polarization gratings and demonstrate +/-40 degree coarse-angle (with 1.25 degree resolution) beam-steering at a near-infrared wavelength (1.5 microns).
  • Feasibility Study of Polarization Gratings for Midwave Infrared Polarimetry
Funded by NASA with University of Florida and University of Central Florida (2008)
Design and fabricate polarization gratings (PGs) optimized for operation across the midwave infrared wavelengths (5 microns to 40 microns) and provide the theoretical modeling, including a recommended design of PGs for the NASA’s SOPHIA airborne telescope project.
  • Wideband OpticaL Fdtd SIMulator (WOLFSIM) – Rigorous Electromagnetic Simulator
Develop an optical simulation tool, WOLFSIM, based on the finite-difference time-domain method especially for efficient modeling of periodic anisotropic media.


Publications

  • Thesis & Dissertation
  1. "Broadband Polarization Gratings for Efficient Liquid Crystal Display, Beam Steering, Spectropolarimetry, and Fresnel Zone Plate," Dissertation, North Carolina State University, Raleigh, NC, USA July 2009. (Link to ETD)
  2. "Finite-Difference Time-Domain Analysis of Periodic Anisotropic Media," Master Thesis, North Carolina State University, Raleigh, NC, USA August 2006. (Link to ETD)


  • Journal Articles
  1. C Oh, J Kim, JF Muth, S Serati, and MJ Escuti, "High-throughput, continuous beam steering using rotating polarization gratings," IEEE Photon Tech Lett, 2009 (in production). (Online (pdf) | Abstract)
  2. C Oh and MJ Escuti, "Achromatic diffraction from polarization gratings with high efficiency," Optics Letters, vol. 33, pp. 2287-2289, 2008. (Online (pdf) | Abstract)
  3. C Oh and MJ Escuti, "Numerical Analysis of Polarization Gratings Using the Finite-Difference Time-Domain Method," Physical Review A, vol. 76, no. 4, num. 043815, 2007.
    (Online (pdf) | Abstract)
  4. RK Komanduri, WM Jones, C Oh, and MJ Escuti, "Polarization-Independent Modulation for Projection Displays Using Small-Period LC Polarization Gratings," Journal of the Society for Information Display, vol. 15, no. 8, pp. 589-594, 2007.
    (Online (pdf) | Abstract)
  5. C Oh and MJ Escuti, "Time-domain analysis of periodic anisotropic media at oblique incidence: an efficient FDTD implementation," Optics Express, vol. 14, no. 24, pp. 11870-11884, 2006.
    (Online (pdf) | Abstract)


  • Conference Proceedings
  1. C Oh, RK Komanduri, BL Conover, and MJ Escuti, "Polarization-Independent Modulation Using Standard Liquid Crystal Microdisplays and Polymer Polarization Gratings," International Display Research Conference, vol. 28, pp. 298-301, 2008.
    (Online (pdf) | Abstract)
  2. RK Komanduri, C Oh, and MJ Escuti, "Reflective liquid crystal polarization gratings with high efficiency and small pitch," Proc. SPIE - Liquid Crystals XII, vol. 7050, art. no. 70500J, 2008.
    (Online (pdf) | Abstract)
  3. C Oh and MJ Escuti, "Electrically switchable achromatic liquid crystal polarization gratings on reflective substrates," Proc. SPIE - Liquid Crystals XII, vol. 7050, art. no. 705019, 2008.
    (Online (pdf) | Abstract)
  4. J Kim, C Oh, MJ Escuti, L Hosting, and S Serati, "Wide-angle nonmechanical beam steering using thin liquid crystal polarization gratings," Proc. SPIE - Advanced Wavefront Control: Methods, Devices, and Applications VI, vol. 7093, art. no. 709302, 2008.
    (Online (pdf) | Abstract)
  5. RK Komanduri, C Oh, MJ Escuti, and DJ Kekas, "Late-News Paper: Polarization Independent Liquid Crystal Microdisplays," SID Symposium Digest, vol. 39, pp. 236-239, 2008.
    (Online (pdf) | Abstract)
  6. C Oh and MJ Escuti, "Achromatic polarization gratings as highly efficient thin-film polarizing beamsplitters for broadband light," Proc. SPIE - Polarization Science and Remote Sensing III, vol. 6682, no. 668211, 2007.
    (Online (pdf) | Abstract)
  7. C Oh and M J Escuti , "Achromatic Diffraction Using Reactive Mesogen Polarization Gratings," SID Symposium Digest, vol. 38, pp. 1401-1404, 2007.
    (Online (pdf) | Abstract)
  8. WM Jones, C Oh, R Komanduri, and MJ Escuti, "Polarization-Independent Modulation for Projection Displays Using Small-Period LC Polarization Gratings," International Display Research Conference, vol. 26, no. 12.5, 2006.
    (Online (pdf) | Abstract)
  9. MJ Escuti, C Oh, C Sanchez, CWM Bastiaansen, and DJ Broer, "Simplified Spectropolarimetry Using Reactive Mesogen Polarization Gratings," Proceedings of the SPIE - Optics & Photonics Conference, vol. 6302, no. 630207, 2006.
    (Online (pdf) | Abstract)
  10. C Oh, RK Komanduri, and MJ Escuti, "FDTD analysis of 100% efficient polarization-independent liquid crystal polarization grating," Proceedings of the SPIE - Liquid Crystals X, vol. 6332, no. 633238, 2006.
    (Online (pdf) | Abstract)
  11. C Oh, RK Komanduri, and MJ Escuti, "FDTD and elastic continuum analysis of the liquid crystal polarization grating," SID Symposium Digest, vol. 37, pp. 844-847, 2006.
    (Online (pdf) | Abstract)