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Optical modes in semiconductor microtube ring resonators
1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, 20355 Hamburg, Germany. ktipp@physnet.uni-hamburg.de
Physical Review Letters
|April 12, 2006
Summary
We demonstrate optical modes in InGaAs/GaAs microtubes functioning as ring resonators. These microtubes, fabricated using lithography and self-rolling bilayers, show sharp optical modes matching theoretical predictions.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Optical ring resonators are crucial for integrated photonics.
- Fabricating complex microstructures with precise optical properties remains challenging.
Purpose of the Study:
- To demonstrate optical modes in InGaAs/GaAs microtubes.
- To investigate their potential as optical ring resonators.
Main Methods:
- Fabrication of self-supporting microtubes using optical lithography and wet-etching.
- Utilizing the self-rolling mechanism of strained bilayers for microtube formation.
- Probing optical modes via photoluminescence of embedded InAs quantum dots.
Main Results:
- Successfully fabricated InGaAs/GaAs microtubes.
- Observed a spectrum of sharp optical modes within the microtubes.
- Demonstrated the microtubes' functionality as optical ring resonators.
- Experimental results showed excellent agreement with theoretical models for closed thin dielectric waveguides.
Conclusions:
- InGaAs/GaAs microtubes can effectively function as optical ring resonators.
- The fabrication method enables the creation of novel micro-optical devices.
- This work opens avenues for advanced photonic integrated circuits.
