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8491874 
Journal Article 
Highly Efficient Silicon Photonic Microheater Based on Black Arsenic-Phosphorus 
Liu, Y; Wang, H; Wang, S; Wang, Y; Wang, Y; Guo, Z; Xiao, S; Yao, Y; Song, Q; Zhang, Han; Xu, Ke 
2020 
0 
Advanced Optical Materials
ISSN: 2195-1071 
8 
6 
English 
WOS:000507118100001 
While black phosphorus has shown excellent optoelectronic properties in many aspects, the environmental instability ultimately places limits on its practical applications. Black arsenic–phosphorus (b-AsP), an alloy of black phosphorus with arsenic atoms, has emerged as a new 2D material with better stability. Recently, the heterostructure via integration of 2D material with nanophotonic waveguides is opening an avenue for many on-chip applications of phosphorene. However, the thermo-optic (TO) properties, which are widely used for waveguide heaters, are not studied on b-AsP yet. Herein, the TO effects of a b-AsP/silicon van der Waals heterostructure are first investigated and its application as a transparent waveguide heater is demonstrated. A high efficiency of 0.74 nm mW−1 is achieved with a nonresonant and broadband heater based on 20 nm thick b-AsP, which eliminates the need for enhancement by cavity-assisted light–matter interaction, and thus allows for compact footprint, broadband operation, and low latency. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 
black arsenic-phosphorus; integrated optics devices; microheaters; thermo-optic effect