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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Graphene-assisted critically-coupled optical ring modulator.

Michele Midrio¹, Stefano Boscolo, Michele Moresco

¹Dipartimento di Ingegneria Elettrica Gestionale e Meccanica, Università degli Studi di Udine, 33100 Udine, Italy. midrio@uniud.it

|November 29, 2012

Summary

This summary is machine-generated.

This study demonstrates a graphene-based optical modulator that controls light loss in a ring cavity. The device offers a 100 GHz bandwidth and low switching energy, compatible with CMOS technology.

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Area of Science:

Photonics
Materials Science
Electrical Engineering

Background:

Graphene exhibits tunable conductivity at optical frequencies due to carrier injection.
Optical modulators are crucial components in photonic integrated circuits.
Critical-coupling in optical cavities enables efficient light-matter interaction.

Purpose of the Study:

To propose and analyze a novel optical modulator utilizing graphene's tunable conductivity.
To leverage the critical-coupling concept for efficient optical modulation.
To assess the performance metrics, including bandwidth and switching energy, of the proposed modulator.

Main Methods:

Numerical simulations were employed to model the graphene-based optical modulator.
The critical-coupling theory was applied to design the ring cavity modulator.
Graphene's optical conductivity modulation was simulated by varying carrier injection.

Main Results:

A modulator with a bandwidth of 100 GHz was designed.
Switching energy was found to be in the order of few femtojoules per bit.
The modulator demonstrated potential for operation with driving voltages below 1.2 volts.

Conclusions:

The proposed graphene-based optical modulator is a viable device for high-speed optical signal processing.
Low switching energy and voltage requirements make it compatible with low-voltage CMOS technology.
This work opens avenues for advanced photonic devices integrated with graphene.