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Published on: September 25, 2020
Broadband, Transmissive, and Cascadable Terahertz Programmable Metasurface.
Hangbing Guo1, Benwen Chen1, Yuan Li2
1Research Institute of Superconductor Electronics (RISE) and Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China.
This study introduces a new transmissive programmable metasurface for terahertz applications. This novel device enables efficient optical matrix operations with a wide modulation bandwidth, overcoming limitations of existing reflective designs.
Area of Science:
- Optics and Photonics
- Metamaterials
- Terahertz Technology
Background:
- Programmable metasurfaces are key for optical information processing.
- Current terahertz metasurfaces are often reflective, limiting integration and bandwidth.
Purpose of the Study:
- To develop a transmissive programmable metasurface for efficient terahertz applications.
- To demonstrate its capability for matrix operations in a cascaded configuration.
Main Methods:
- Fabrication of a transmissive metasurface using a vanadium dioxide film on an ultrathin substrate.
- Utilizing an 8x8 array of addressable pixels.
- Cascading dual-layer configurations for matrix operations.
Main Results:
- Achieved insertion loss < 3 dB in the ON state below 1 THz.
- Demonstrated >75% modulation depth from 1.01 to 1.80 THz.
- Exhibited >50% modulation across 0.51-1.80 THz (111% modulation bandwidth).
- Device operates under bent conditions.
Conclusions:
- The proposed transmissive metasurface offers a pathway to compact, efficient, and multifunctional optical systems.
- Its thin profile, stacking ease, and efficient transmission are advantageous.
- Overcomes limitations of reflective terahertz metasurfaces.
