Title: A Tunable Metasurface Deflector Based on MIM Waveguide Filled with Phase-Change Material 

Author(s): Ha, YL (Ha, Yingli); Guo, YH (Guo, Yinghui); Pu, MB (Pu, Mingbo); Li, X (Li, Xiong); Ma, XK (Ma, Xiaoliang); Luo, XG (Luo, Xiangang) 

Source: PLASMONICS  Volume: 14  Issue: 6  Pages: 1735-1741  DOI: 10.1007/s11468-019-00962-5  Published: DEC 2019   

Abstract: Metasurfaces hold great promise for overcoming the limitations of conventional refractive and diffractive optics due to their unique electromagnetic properties. Nevertheless, most of the functional metasurfaces are static. Besides, beam-steering only is discretely realized for no more than three states. A new strategy for on-chip planar metasurface is proposed to realize tunable light manipulation. Benefit from fast phase transitions of phase-change material and linear gradient phase generated by metasurfaces, continuously beam-steering within +/- 60 degrees at 10.6 mu m can be achieved in metal-insulator-metal (MIM) waveguide. Moreover, the number of addressable point of the scanning deflector is theoretically estimated to be 12, about 4 times of the previous report. The designed deflector with compact size and reconfigurable functionalities may have potential for applications in multifunctional photonic circuits. 

ISSN: 1557-1955 

eISSN: 1557-1963