Soongsil University Develops Color Filter Technology Using New Optical Device

Polarization-Selective Color Filter Technology Developed Through This Study and Application Examples (Provided by Soongsil University)

[Asia Economy Reporter Lee Hyun-joo] Soongsil University announced on the 4th that a research team's paper, co-authored by Professor Lee Hojin of the Department of Electronic and Information Engineering and Professor Choi Hyunyong of the Department of Physics and Astronomy at Seoul National University, was published in the August issue of the world-renowned nanotechnology journal 'Nano Letters.' The paper titled "Polarization-Selective Color Filter Based on Plasmonic Nanograting and Etalon Structures" presents the development of a color filter technology combining nanoscale patterns and etalon structures that can select color and image information according to the polarization of light in the visible spectrum. In this study, by combining plasmonic nanopatterns and etalon structures, a new optical device was developed that can change the image information appearing depending on the direction of incident light. Plasmonics is a technology that controls light in regions smaller than the diffraction limit of light by using nanosized metal structures, enabling the adjustment of transmission of various visible light spectra. An etalon is an optical device in the form of multiple reflective plates, and by adjusting the refractive index or thickness of the layers within the structure, it can modulate the interference pattern of light passing through it. By combining these two technologies, the research achieved high optical efficiency while realizing an unprecedented high polarization selectivity by displaying specific images in vivid color or completely disappearing depending on the polarization direction of light.

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