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학술지 Design Method of Tunable Pixel with Phase-Change Material for Diffractive Optical Elements
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저자
이승열, 김한나, 김용해, 김태엽, 조성목, 강한별, 황치선
발행일
201706
출처
ETRI Journal, v.39 no.3, pp.390-397
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.17.0116.0004
협약과제
15MB8100, 모바일 완전입체 단말 및 콘텐츠 기술 개발, 황치선
초록
In this paper, we propose a scheme for designing a tunable pixel layer based on a Ge2Sb2Te5 (GST) alloy thin film. We show that the phase change of GST can significantly affect the reflection characteristic when the GST film is embedded into a dielectric encapsulation layer. We investigate the appropriate positions of the GST film within the dielectric layer for high diffraction efficiency, and we prove that they are antinodes of Fabry-Perot resonance inside the dielectric layer. Using the proposed scheme, we can increase the diffraction efficiency by about ten times compared to a bare GST film pixel, and 80 times for the first-to-zeroth-order diffraction power ratio. We show that the proposed scheme can be designed alternatively for a broadband or wavelength-selective type by tuning the dielectric thickness, and we discuss a multiphase example with a double-stack structure.
키워드
Diffraction gratings, Fabry-Perot resonance, Ge2Sb2Te5, Phase-Change material, Spatial light modulator
KSP 제안 키워드
Alloy thin film, Design method, Dielectric thickness, Diffraction grating, Diffractive optical elements, Encapsulation layer, Fabry-Perot resonance, High diffraction efficiency, Phase Change Material(PCM), Reflection characteristics, Spatial light modulator(SLM)