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Experimental Demonstration of >230° Phase Modulation in Gate-Tunable Graphene-Gold Reconfigurable Mid-Infrared

Michelle C Sherrott, Philip W C Hon¹, Katherine T Fountaine¹

¹Northrop Grumman Corporation, NG Next Nanophotonics & Plasmonics Laboratory, Redondo Beach, California 90278, United States.

|April 27, 2017

Summary

This summary is machine-generated.

Researchers demonstrate electronically reconfigurable metasurfaces for mid-infrared beam steering. This technology achieves significant phase modulation, paving the way for advanced optical devices.

Keywords:

Metasurface beam steering field-effect modulation graphene mid-infrared phase modulation

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Area of Science:

Optics and Photonics
Materials Science

Background:

Metasurfaces enable precise control over light propagation (amplitude, polarization, phase) at interfaces.
Electronically reconfigurable metasurfaces are crucial for dynamic optical systems.

Purpose of the Study:

To report phase modulation of an electronically reconfigurable metasurface.
To demonstrate its application in mid-infrared beam steering.

Main Methods:

Utilized a gate-tunable graphene-gold resonator geometry.
Experimentally measured reflected phase modulation at various mid-infrared wavelengths.
Performed antenna array calculations incorporating experimental data and device nonidealities.

Main Results:

Achieved a phase modulation range of up to 237° at 8.50 μm.
Observed smooth, monotonic phase modulation (0° to 206°) with applied voltage at 8.70 μm.
Calculated an average beam steering efficiency of 23% for reflected light up to 30°.
Projected 1% absolute efficiency up to 30° considering device nonidealities.

Conclusions:

The demonstrated graphene-gold resonator geometry is suitable for reconfigurable mid-infrared beam steering.
Electronically controlled phase modulation is key to achieving dynamic beam steering functionalities.