材料科学
光学
相位调制
各向异性
液晶
相(物质)
光电子学
调制(音乐)
光束转向
传输(电信)
带宽(计算)
测距
空间光调制器
光调制器
调幅
梁(结构)
频率调制
物理
计算机科学
声学
电信
相位噪声
量子力学
作者
Ziwei Yang,Mingkai Liu,Andrei Komar,Lei Xu,Dragomir N. Neshev
标识
DOI:10.1002/adom.202101893
摘要
Pure phase modulation of light is vital for a number of optical devices such as spatial light modulators and beam steering in light detection and ranging (LIDAR) technologies. Tunable metasurfaces have recently provided a feasible alternative to existing technologies, allowing for ultra-high miniaturisation while enabling high transmission efficiency and tunability under small external stimuli. However, despite the recent advances in the field, no pure phase tuning has been demonstrated in transmissive devices, for example, any implementation of continuous phase tuning is accompanied by sizable amplitude modulation or low efficiency. Here, it is shown that the optical anisotropy of the surrounding material can enable phase-only tuning of optical metasurfaces in the full 2π range with unitary efficiency over a sizable bandwidth. A practical implementation of this concept based on a liquid-crystal infiltrated metasurface operating in the regime of extreme Huygens condition is further proposed. In this way, the full 2π phase-only tunability in transmission can be enabled by controlling bias voltage and temperature variation of the surrounding liquid crystal.
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