Phase change material-based nano-cavity as an efficient optical modulator.

Nanotechnology
Sandeep Kumar ChamoliChunlei Guo

Abstract

Structural phase transition induced by temperature or voltage in phase change materials has been used for many tunable photonic applications. Exploiting reversible and sub-ns fast switching in antimony trisulfide (Sb2S3) from amorphous (Amp) to crystalline (Cry), we introduced a reflection modulator based on metal-dielectric-metal structure. The proposed design exhibits tunable, perfect, and multi-band absorption from visible to the near-infrared region. The reflection response of the system shows >99% absorption of light at normal incidence. The maximum achievable modulation efficiency with a narrow line width is ∼98%. Interestingly, the designed cavity supports critical resonance in an ultrathin (∼λ/15) Sb2S3 film with perfect, broadband, and tunable absorption. Finally, we proposed a novel hybrid cavity design formed of Cry and Amp Sb2S3 thin films side-by-side to realize an optical modulator via relative motion between the incident light beam and cavity. The proposed lithographic free structure can be also used for filtering, optical switching, ultrathin photo-detection, solar energy harvesting, and other energy applications.

References

Mar 13, 2003·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Shanhui FanJ D Joannopoulos
Jun 25, 2009·Optics Express·Changjun Min, Georgios Veronis
Sep 23, 2009·Optics Express·Xiaomin WangYoshimichi Ohki
Dec 11, 2013·Optics Letters·Qijing LuChang-Ling Zou
Oct 19, 2017·Optics Express·Kebin FanWillie J Padilla
Mar 10, 2018·Optics Express·Peng JiDuk-Yong Choi
Apr 11, 2018·Advanced Materials·Kandammathe Valiyaveedu SreekanthRanjan Singh
Apr 1, 2020·Optics Express·Alessandro PianelliJanusz Parka

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Citations

Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Xiaoxiao WangQihuang Gong

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