can thus be switched between unpolarized response and horizontal and vertical linear polarization at this wavelength.
Source PDF · page 5RESEARCH PAPER
Gate-Tunable Multiband van der Waals Photodetector and Polarization Sensor
Daozhi Shen, HeeBong Yang, Tarun Patel, Daniel A. Rhodes, Thomas Timusk, Y. Norman Zhou, Na Young Kim, Adam W. Tsen
Research context
A single photodetector with tunable detection wavelengths and polarization sensitivity can potentially be harnessed for diverse optical applications ranging from imaging and sensing to telecommunications. Such a device will require the combination of multiple material systems with different structures, band gaps, and photoelectrical responses, which is extremely difficult to engineer using traditional epitaxial films. Here, we develop a multifunctional and high-performance photosensor using all van der Waals materials. The device features a gate-tunable spectral response that is switchable between near-infrared/visible and short-/midwave infrared, as well as broad-band operation, at room temperature. The linear polarization sensitivity in the telecommunication O-band can also be directly modulated between horizontal, vertical, and nonpolarizing modes. These effects originate from the balance of photocurrent generation in two of the active layers that can be manipulated by an electric field. The photodetector features high detectivity (>10 9 cmHz 1/2 W –1 ) together with fast operation speed (∼1 MHz) and can be further exploited for dual visible and infrared imaging.
Source & review
Contains findings linked to source PDF pages.
Cite / 引用
Daozhi Shen, HeeBong Yang, Tarun Patel, Daniel A. Rhodes, Thomas Timusk, Y. Norman Zhou, Na Young Kim, Adam W. Tsen. Gate-Tunable Multiband van der Waals Photodetector and Polarization Sensor. ACS Nano (2024). https://doi.org/10.1021/acsnano.4c00181
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