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Whispering gallery mode lasing from zinc oxide hexagonal nanodisks
Daniel J Gargas1, Michael C Moore, Adrian Ni
1Department of Chemistry, University of California, Berkeley, California 94720, USA.
ACS Nano
|April 27, 2010
Summary
Researchers synthesized ZnO nanodisks for low-threshold whispering gallery mode (WGM) lasing. These subwavelength semiconductor nanostructures demonstrate ultraviolet WGM lasing, paving the way for on-chip nanophotonic integration.
Area of Science:
- Nanophotonics
- Semiconductor Nanostructures
- Laser Physics
Background:
- Whispering gallery mode (WGM) cavities offer low-loss optical confinement via total internal reflection.
- WGM resonators enable high-quality (Q) factors, crucial for efficient lasing.
- Subwavelength nanostructures are key for miniaturizing photonic devices.
Purpose of the Study:
- To synthesize disk-shaped semiconductor nanostructures for WGM lasing.
- To investigate the lasing properties of ZnO nanodisks with subwavelength diameters.
- To demonstrate the potential for on-chip nanophotonic integration.
Main Methods:
- Bottom-up chemical synthesis of ZnO nanodisks.
- Characterization of individual nanodisk lasing properties.
- Finite difference time domain (FDTD) simulations for mode analysis.
Main Results:
- Successful synthesis of ZnO nanodisks with diameters ranging from 280 to 900 nm.
- Demonstration of single-mode ultraviolet WGM lasing in subwavelength ZnO disks.
- FDTD simulations confirmed WGM confinement within subwavelength disks.
Conclusions:
- Chemically synthesized ZnO nanodisks support efficient WGM lasing.
- Subwavelength diameter nanodisks are viable for ultraviolet laser applications.
- These findings advance the development of integrated nanophotonic devices.
