Electrically tunable two-dimensional heterojunctions for miniaturized near-infrared spectrometers

Wenjie Deng; Zilong Zheng; Jingzhen Li; Rongkun Zhou; Xiaoqing Chen; Dehui Zhang; Yue Lu; Chongwu Wang; Congya You; Songyu Li; Ling Sun; Yi Wu; Xuhong Li; Boxing An; Zheng Liu; Qi Jie Wang; Xiangfeng Duan; Yongzhe Zhang

doi:10.1038/s41467-022-32306-z

Electrically tunable two-dimensional heterojunctions for miniaturized near-infrared spectrometers

Nat Commun. 2022 Aug 8;13(1):4627. doi: 10.1038/s41467-022-32306-z.

Authors

Wenjie Deng^#^{1

2

3}, Zilong Zheng^#², Jingzhen Li^#¹, Rongkun Zhou², Xiaoqing Chen¹, Dehui Zhang^{4

5}, Yue Lu⁶, Chongwu Wang³, Congya You^{1

2}, Songyu Li^{1

2}, Ling Sun², Yi Wu^{1

2}, Xuhong Li^{1

2}, Boxing An^{1

2}, Zheng Liu⁷, Qi Jie Wang^{3

8}, Xiangfeng Duan^{9

10}, Yongzhe Zhang^{11

12}

Affiliations

¹ Key Laboratory of Optoelectronics Technology, Ministry of Education, Faculty of Information Technology, Beijing University of Technology, Beijing, 100124, China.
² Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China.
³ Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
⁴ Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
⁵ California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
⁶ Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China.
⁷ School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
⁸ Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
⁹ Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA. xduan@chem.ucla.edu.
¹⁰ California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA. xduan@chem.ucla.edu.
¹¹ Key Laboratory of Optoelectronics Technology, Ministry of Education, Faculty of Information Technology, Beijing University of Technology, Beijing, 100124, China. yzzhang@bjut.edu.cn.
¹² Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China. yzzhang@bjut.edu.cn.

^# Contributed equally.

Abstract

Miniaturized spectrometers are of considerable interest for their portability. Most designs to date employ a photodetector array with distinct spectral responses or require elaborated integration of micro & nano optic modules, typically with a centimeter-scale footprint. Here, we report a design of a micron-sized near-infrared ultra-miniaturized spectrometer based on two-dimensional van der Waals heterostructure (2D-vdWH). By introducing heavy metal atoms with delocalized electronic orbitals between 2D-vdWHs, we greatly enhance the interlayer coupling and realize electrically tunable infrared photoresponse (1.15 to 1.47 μm). Combining the gate-tunable photoresponse and regression algorithm, we achieve spectral reconstruction and spectral imaging in a device with an active footprint < 10 μm. Considering the ultra-small footprint and simple fabrication process, the 2D-vdWHs with designable bandgap energy and enhanced photoresponse offer an attractive solution for on-chip infrared spectroscopy.

Abstract

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