Optical Chirality Detection Using a Topological Insulator Transistor
Optical Chirality Detection Using a Topological Insulator Transistor
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DOI：
10.1002/adom.202002210
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发表时间：
2021-03-19
影响因子：
9
通讯作者：
Xu, Xianfan
中科院分区：
文献类型：
--
作者：
Huang, Shouyuan;Xu, Xianfan
Optical chirality is an effective means in screening molecules and their enantiomers in bioengineering, and recently has garnered attention as an implementation of qubits in quantum information processing. The conventional detection of circularly polarized light (CPL) is based on phase retardation and polarization separation using multiple optical components. An intrinsic solid-state chirality detection device would be favorable for easier integration and implementation. Optical spin injection to the spin-momentum-locked topological surface states of topological insulators (TIs) by circularly polarized light leads to a directional DC photocurrent and hence possible circular polarization detection. However, this DC photocurrent is also accompanied by other photo-responses. Here, a photodetection strategy using a TI transistor which senses CPL without the use of any additional components is demonstrated, it achieves a uniform response over the entire device with a sensitivity approximate to 5.6%. The Stokes parameters can also be extracted by arithmetic operation of photocurrents obtained with different bias and gate for a complete characterization of a polarized light beam. Therefore, this method enables chirality detection and Stokes parameter analysis using a single device. The proposed miniaturized intrinsic chirality detectors facilitate polarimetry sensing in applications from circular dichroism spectroscopy to biomedical diagnosis.
