首页|Tunable hexagonal boron nitride topological optical delay line in the visible region
Tunable hexagonal boron nitride topological optical delay line in the visible region
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Tunability,ultracompact design,high group index,low loss,and broad bandwidth are desired properties for integrated optical delay lines[0DLs].However,those properties are challenging to achieve simultaneously in the visible region.This paper proposes a tunable hexagonal boron nitride topological optical delay line[0DL]in the visible region based on valley photonic crystals.The topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero,which results in a large group index of 629 at 645 nm.Moreover,we demonstrate tuning of the slow-light wavelength and optical delay times with electrically tunable liquid crystals by applying external voltage.The device has an ultracompact size of 5 μm × 2.7 μm with an optical delay distance of 25a[a is the lattice constant]and a delay time of 12 ps.0ur design can provide a new possibility for designing 0DLs working in the visible region for optical communication and quantum computing systems.
valley photonic crystaltopological edge statesoptical delay lines
费宏明、武敏、林瀚、杨毅彪、肖连团
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College of Physics,Taiyuan University of Technology,Taiyuan 030024,China
College of Information Engineering,Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030619,China
College of Science,RMIT University,Melbourne,Victoria 3000,Australia
College of Electronic Information and 0ptical Engineering,Taiyuan University of Technology,Taiyuan 030024,China
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National Key Research and Development Program of ChinaAustralian Research Council Future FellowshipNational Natural Science Foundation of China(NSFC)
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