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Third harmonic generation from graphene lying on different substrates: optical-phonon resonances and interference
Optics Express
|March 1, 2017
Summary
Graphene
Area of Science:
- Nonlinear optics
- Condensed matter physics
- Materials science
Background:
- Graphene exhibits nonlinear optical properties, enabling applications like frequency mixing.
- Third harmonic generation (THG) is a key nonlinear optical process.
- Substrate interactions can significantly modify graphene's optical response.
Purpose of the Study:
- To theoretically investigate third harmonic generation (THG) in graphene on various dielectric substrates.
- To explore methods for enhancing THG intensity in graphene.
- To analyze the influence of substrate properties on graphene's nonlinear optical response.
Main Methods:
- Theoretical modeling of THG in graphene.
- Analysis of graphene on dispersionless and polar dielectric substrates.
- Consideration of substrates with and without back-side metallization.
Main Results:
- THG intensity from graphene on substrates can be orders of magnitude higher than in isolated graphene.
- Substrate effects, such as LO-phonon resonances in polar dielectrics and interference in metalized substrates, boost THG.
- Polar dielectric substrates can lead to a nearly frequency-independent THG response.
Conclusions:
- Substrate engineering offers a powerful route to enhance graphene-based nonlinear optical devices.
- Graphene's nonlinear optical properties can be tailored for efficient frequency multiplication.
- The findings support the development of graphene frequency multipliers for microwave to infrared applications.
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