Photocurrent detection of the orbital angular momentum of light

doi:10.1126/science.aba9192

GSTDTAP > 气候变化

DOI	10.1126/science.aba9192
	Photocurrent detection of the orbital angular momentum of light
	Zhurun Ji; Wenjing Liu; Sergiy Krylyuk; Xiaopeng Fan; Zhifeng Zhang; Anlian Pan; Liang Feng; Albert Davydov; Ritesh Agarwal
	2020-05-15
发表期刊	Science
出版年	2020
英文摘要	Light has several degrees of freedom (wavelength, polarization, pulse length, and so on) that can be used to encode information. A light beam or pulse can also be structured to have the property of orbital angular momentum, becoming a vortex. Because the winding number of the vortex can be arbitrary, the channel capacity can be expanded considerably. Zhang et al. and Ji et al. developed nanophotonic-based methods for generating and electrically detecting light with arbitrary orbital angular momentum, a goal that has remained an outstanding challenge so far (see the Perspective by Ge). The nanophotonic platform provides a route for developing high-capacity optical chips. Science , this issue p. [760][1], p. [763][2]; see also p. [707][3] Applications that use the orbital angular momentum (OAM) of light show promise for increasing the bandwidth of optical communication networks. However, direct photocurrent detection of different OAM modes has not yet been demonstrated. Most studies of current responses to electromagnetic fields have focused on optical intensity–related effects, but phase information has been lost. In this study, we designed a photodetector based on tungsten ditelluride (WTe2) with carefully fabricated electrode geometries to facilitate direct characterization of the topological charge of OAM of light. This orbital photogalvanic effect, driven by the helical phase gradient, is distinguished by a current winding around the optical beam axis with a magnitude proportional to its quantized OAM mode number. Our study provides a route to develop on-chip detection of optical OAM modes, which can enable the development of next-generation photonic circuits. [1]: /lookup/doi/10.1126/science.aba8996 [2]: /lookup/doi/10.1126/science.aba9192 [3]: /lookup/doi/10.1126/science.abb8091
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/267720
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Zhurun Ji,Wenjing Liu,Sergiy Krylyuk,et al. Photocurrent detection of the orbital angular momentum of light[J]. Science,2020.
APA	Zhurun Ji.,Wenjing Liu.,Sergiy Krylyuk.,Xiaopeng Fan.,Zhifeng Zhang.,...&Ritesh Agarwal.(2020).Photocurrent detection of the orbital angular momentum of light.Science.
MLA	Zhurun Ji,et al."Photocurrent detection of the orbital angular momentum of light".Science (2020).