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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Lasing behavior modulation for ZnO whispering-gallery microcavities.

Gangyi Zhu¹, Chunxiang Xu, Lisha Cai

¹State Key Laboratory of Bioelectronics, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China.

ACS Applied Materials & Interfaces

|October 20, 2012

Summary

This summary is machine-generated.

Researchers improved lasing characteristics in whispering-gallery-mode (WGM) microcavities by modifying zinc oxide (ZnO) microrods with polymers. This enhancement utilized total internal reflection (TIR) and a modified WGM equation for better optical performance.

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Whispering-gallery-mode (WGM) microcavities are crucial for optical devices.
Modulating lasing characteristics in microcavities is essential for advanced applications.
Polymer modification offers a route to tune microcavity performance.

Purpose of the Study:

To design and fabricate WGM microcavities for modulated lasing.
To investigate the effect of polymer modification on ZnO microrod surfaces.
To analyze lasing behaviors using a modified WGM equation and optical simulations.

Main Methods:

Fabrication of four WGM microcavity configurations on hexagonal ZnO microrods.
Surface modification using polyvinylcarbazole (PVK) polymer.
Application of total internal reflection (TIR) principles.
Modification of the standard WGM lasing mode equation for asymmetric structures.
Optical field distribution simulation using the 2D finite difference time-domain (FDTD) method.

Main Results:

Improved lasing characteristics achieved by increasing the relative refractive index.
Observed lasing behaviors (mode position, numbers, quality factor) analyzed with the modified WGM equation.
TE mode optical field distributions simulated using FDTD.
Simulation results showed good agreement with experimental findings.
Polymer modification effectively tuned the lasing properties.

Conclusions:

The study successfully demonstrated polymer-modified ZnO microrod WGM microcavities with enhanced lasing properties.
The modified WGM equation accurately describes lasing behaviors in asymmetric structures.
FDTD simulations validate the resonance mechanism in the fabricated microcavities.
This work provides insights into designing advanced WGM microcavity lasers.