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Widely Tunable Distributed Bragg Reflectors Integrated into Nanowire Waveguides.
Anthony Fu1, Hanwei Gao1,2, Petar Petrov
1Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Nano Letters
|September 18, 2015
Summary
Researchers developed nanoscale distributed Bragg reflectors (DBRs) within gallium nitride (GaN) nanowires. These DBRs enable tunable photonic band gaps for enhanced optical device performance and novel functionalities.
Area of Science:
- Photonics
- Nanotechnology
- Materials Science
Background:
- Periodic structures are crucial for advanced optical components.
- Distributed Bragg reflectors (DBRs) are key elements in lasers and mirrors.
- Gallium nitride (GaN) nanowires offer unique optical properties.
Purpose of the Study:
- To integrate nanoscale DBRs into GaN nanowire waveguides.
- To demonstrate tunable photonic band gaps across the visible spectrum.
- To extract the refractive index of GaN nanowires for device design.
Main Methods:
- Fabrication of DBRs within GaN nanowires.
- Optical characterization of photonic band gaps.
- Numerical simulations for reflection coefficient comparison.
- Spectroscopic analysis to determine refractive index.
Main Results:
- Tunable photonic band gaps achieved by controlling grating parameters.
- In-wire DBRs exhibit significantly higher reflection coefficients than end facets.
- Refractive index of GaN nanowire waveguides successfully extracted.
Conclusions:
- Nanoscale DBRs in GaN nanowires enable tunable photonic band gaps.
- This integration enhances optical component performance.
- Potential for developing advanced nanowire-based optical resonators and routers.
