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Van der Waals Heterostructure Mid-Infrared Emitters with Electrically Controllable Polarization States and Spectral
Po-Liang Chen1, Tian-Yun Chang1, Pei-Sin Chen1
1Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS Nano
|May 22, 2023
Summary
Researchers developed novel mid-infrared emitters using black phosphorus and MoS2. These devices allow electrical switching of emission wavelength and polarization, simplifying advanced optical systems.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Modern infrared (IR) systems require precise control over light's spectral and polarization properties.
- Current methods often involve bulky and complex setups with multiple optical components.
Purpose of the Study:
- To develop compact, tunable mid-infrared emitters.
- To enable electrical switching of emission wavelength and polarization states.
Main Methods:
- Fabrication of two-terminal devices using stacked anisotropic materials: black phosphorus and black arsenic-phosphorus with MoS2.
- Engineering heterostructures with controlled crystallographic orientations and band profiles.
- Utilizing bias polarity to independently activate distinct electroluminescence (EL) units.
Main Results:
- Demonstrated mid-IR emitters with electrically switchable peak wavelengths and orthogonal linear polarization states.
- Achieved independent activation of two distinct EL units by tuning bias polarity.
- Showcased broad spectral coverage (3-5 μm) and tunable spectral shapes in pulsed mode.
Conclusions:
- The developed emitters offer a simplified approach to controlling mid-IR light properties.
- These devices have potential applications in advanced IR microscopy, communication, and sensing.
