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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Individually tunable array reflector for amplitude and phase modulation.

Gongli Xiao, Jiapeng Su, Hongyan Yang

|October 15, 2022

Summary

This summary is machine-generated.

We created an adjustable terahertz reflector using graphene and vanadium dioxide. This device precisely controls terahertz beam focusing, offering new possibilities for optical devices.

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Area of Science:

Terahertz (THz) optics and photonics
Metamaterials and nanophotonics
Solid-state physics

Background:

Graphene exhibits tunable phase modulation properties.
Vanadium dioxide possesses temperature-dependent amplitude modulation.
Individually adjustable reflectors are crucial for advanced optical systems.

Purpose of the Study:

To develop an individually adjustable array reflector for terahertz frequencies.
To leverage graphene's phase and vanadium dioxide's amplitude modulation.
To enable precise control over terahertz beam characteristics.

Main Methods:

Theoretical analysis of voltage effects on graphene's Fermi level.
Analysis of temperature effects on vanadium dioxide's conductivity.
Simulation of beam focusing and reflected beam characteristics.
Linking controllable parameters to independent cell regulation.

Main Results:

Demonstrated precise control over focus point position, intensity, and scattering degree.
Showcased the ability to control wide-angle incident light with phase compensation.
Validated the independent adjustability of each cell in the array reflector.

Conclusions:

The developed array reflector offers a novel concept for tunable optical devices.
The structure shows significant potential for applications in terahertz focusing lenses.
Independent regulation of array cells enables sophisticated beam manipulation.