Design of high-Q silicon-polymer hybrid photonic crystal nanobeam microcavities for low-power and ultrafast all-optical switching |
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| Institution: | 1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, People''s Republic of China;2. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, People''s Republic of China;1. AITEM, Amity University, Noida 201303, India;2. Department of Physics, Digamber Jain College, Baraut, India;3. Department of Physics, Govt. Engineering College, Bikaner, India;4. IIMT, Greater Noida, India;1. Photonics Research Center, School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland;2. Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China;3. School of Physics, Trinity College Dublin, Dublin 2, Ireland;4. CRANN, Trinity College, Dublin 2, Ireland;1. Ulyanovsk Branch of Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences, 432011 Ulyanovsk, Russia;2. Technological Research Institute, Ulyanovsk State University, 432700 Ulyanovsk, Russia;3. CREOL, The College of Optics and Photonics, University of Central Florida, 32816 Orlando, FL, USA;4. National Research University of Information Technologies, Mechanics and Optics, 197101 St. Petersburg, Russia;5. Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences, 125009 Moscow, Russia;1. Physics Department, University of Tabriz, Tabriz, Iran;2. Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran |
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| Abstract: | Owing to the unique optical properties high-Q photonic crystal nanobeam microcavities have been demonstrated in a variety of materials. In this paper the design of high-Q silicon-polymer hybrid photonic crystal nanobeam microcavities is investigated using the three-dimensional plane-wave expansion method and finite-difference time-domain method. We first discuss the design of high-Q nanobeam microcavities in silicon-on-insulator, after which the polymer is introduced into the air void to form the hybrid structures. Quality factor as high as 1 × 104 has been obtained for our silicon-polymer hybrid nanobeam microcavities without exhaustive parameter examination. In addition the field distribution of resonant mode can be tuned to largely overlap with polymer materials. Because of the overwhelmingly large Kerr nonlinearity of polymer over silicon, the application in all-optical switching is presented by studying the shift of the resonant frequency on the change of refractive index of polymer. The minimum switching intensity of only 0.37 GW/cm2 is extracted for our high-Q hybrid microcavities and the corresponding single pulse energy is also discussed according to the pumping methods. The total switching time is expected to be restricted by the photon lifetime in cavity due to the ultrafast response speed of polymer. Our silicon-polymer hybrid nanobeam microcavities show great promise in constructing small-sized all-optical devices or circuits with advantages of possessing low-power and ultrafast speed simultaneously. |
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| Keywords: | Photonic crystal cavity All-optical switching Silicon-polymer hybrid |
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