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Tunable dual-band graphene-based infrared reflectance filter
Optics Express
|May 3, 2018
Summary
This study presents a tunable optical filter controlling infrared light amplitude in two spectral bands. The device uses electrostatic gating to tune graphene plasmons, enabling dynamic spectral control for infrared applications.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Graphene exhibits unique plasmonic properties tunable via electrostatic gating.
- Controlling light-matter interactions in specific spectral regions is crucial for advanced optical devices.
Purpose of the Study:
- To demonstrate an actively tunable optical filter for controlling reflected long-wave-infrared light.
- To achieve simultaneous amplitude control in two distinct spectral regions using graphene plasmons.
Main Methods:
- Experimental demonstration of an actively tunable optical filter based on graphene.
- Utilizing electrostatic gating to modify the Fermi-level of graphene and tune plasmon excitation.
- Employing electromagnetic simulations to verify the tuning mechanism involving light coupling to graphene plasmons via a grating structure.
Main Results:
- Simultaneous control of reflected amplitude in two separate spectral regions.
- Achieved over 15% variation in reflected amplitude within tunable bands.
- Demonstrated shifts in resonance positions exceeding 90 cm-1.
Conclusions:
- The developed device enables active tuning of optical filters in the infrared spectrum.
- The design's tunability depends on graphene properties, device geometry, and dielectric environment.
- The demonstrated approach is adaptable for a wide range of infrared frequencies.
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