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Updated: Feb 26, 2026

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

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Wide Angle Polarization-Independent 6-Bit Optical Modulator Using Phase Change Material.

Atchyut Phalgun Malireddi¹, Suresh Chejarla², Srini Krishnamurthy^3,4

¹Advanced Memory and Computing Research Centre, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India 600036.

|February 25, 2026

Summary

This summary is machine-generated.

This study introduces a novel reflective optical modulator using phase change material (Ge2Sb1Te4) for efficient free-space optical communication. It achieves an 87% modulation depth and 6-bit multilevel encoding for high-density data transmission.

Keywords:

1550 nm wavelength multilevel programming phase change materials reconfigurable reflective optical modulator

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Area of Science:

Photonics and Optical Engineering
Materials Science
Optical Communication Systems

Background:

Reflective optical modulators are crucial for free-space optical communication.
Key challenges include achieving angle, wavelength, and polarization independence with high modulation depth.

Purpose of the Study:

To present a novel reflective optical modulator based on phase change material (Ge2Sb1Te4).
To demonstrate high modulation depth and multilevel encoding capabilities for advanced optical data transmission.

Main Methods:

Integration of Ge2Sb1Te4 into a planar cavity capped with SiNx.
Utilizing the material's significant changes in refractive index (Δn ≈ 3.44, Δk ≈ 1.3) and low absorption (k ≈ 0.03).
Controlled optical excitation to achieve discrete reflectance states.

Main Results:

Achieved an 87% modulation depth (ΔR) for 1550 nm light at near-normal incidence.
Realized 64 discrete reflectance states between amorphous and crystalline phases.
Demonstrated 6-bit multilevel encoding for high-density optical data transmission.

Conclusions:

The Ge2Sb1Te4-based modulator offers a promising solution for high-performance optical communication.
The device achieves high modulation depth and multilevel encoding without meta-surface or plasmonic structures.
This technology enables efficient and high-density optical data transmission.