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Electrospray Deposition of Uniform Thickness Ge23Sb7S70 and As40S60 Chalcogenide Glass Films

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Published on: August 19, 2016

Chalcogenide Phase Change Material for Active Terahertz Photonics.

Prakash Pitchappa^1,2, Abhishek Kumar^1,2, Saurav Prakash^3,4

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)

|January 29, 2019

Summary

This summary is machine-generated.

This study demonstrates a novel terahertz metamaterial using phase change materials (PCM) for multilevel, nonvolatile resonance switching. This breakthrough enables new terahertz technologies with spatial and temporal control.

Keywords:

germanium antimony telluride metamaterials non-volatile photonics photonics terahertz ultrafast modulators

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Area of Science:

Photonics and Metamaterials
Materials Science
Terahertz Technology

Background:

Chalcogenide phase change materials (PCM) exhibit unique optical properties, enabling photonic devices like non-von Neumann memory and reconfigurable nanoplasmonics.
Current applications of PCM photonics are primarily limited to optical and infrared frequencies.
There is a need for advanced materials and devices operating at terahertz frequencies.

Purpose of the Study:

To demonstrate a phase change material integrated terahertz metamaterial.
To achieve multilevel nonvolatile resonance switching with spatial and temporal selectivity.
To explore novel terahertz technologies enabled by this new metamaterial.

Main Methods:

Fabrication of a terahertz metamaterial integrated with a phase change material film.
Control of the crystalline proportion of the PCM film to tune resonance states.
Application of localized electrical stimulus for spatially selective reconfiguration.
Investigation of ultrafast optical modulation of terahertz resonances.

Main Results:

Realization of multilevel, nonvolatile terahertz resonance switching states with long retention time and zero hold power.
Demonstration of spatially selective reconfiguration at sub-metamaterial scale.
Observation of ultrafast optical modulation with tunable switching speed based on PCM crystalline order.

Conclusions:

The developed PCM metamaterial offers multilevel, nonvolatile, and spatially/temporally selective terahertz resonance switching.
This technology paves the way for disruptive terahertz applications, including spatio-temporal modulators for high-speed communication, neuromorphic photonics, and machine-learning metamaterials.