Flexible microresonators : lasing and sensing
Ta, Van Duong
Date of Issue2014
Proceedings of SPIE- Laser Resonators, Microresonators, and Beam Control XVI
School of Physical and Mathematical Sciences
Microresonators have drawn a great deal of interest for their importance in both practical applications and fundamental physics in light-matter interaction. The optical confinement provided by a microresonator greatly enhances the interaction between optical spatial mode and the light emitting materials. Conventional fabrication of microresonators adopting semiconductor processing technology (no matter top-down or bottom-up approach) still faces some challenges. Here we report the feasibility of constructing solid state microresonators with various configurations including spheres, hemispheres and fibres from organic polymer in a flexible way. We realize optically pumped lasing from these structures after incorporating organic dye materials and/or colloidal quantum dots into the resonators. The lasing characteristics have been systematically examined in terms of size dependence and polarization. The longitudinal optical modes are well defined by whispering gallery modes. We are also able to tune the resonance modes by deforming the shape of micro-spheres, representing the facile manipulation of light-matter interaction. Finally, refractive index sensing with high sensitivity can be readily realized from these structures enabled by the existence of evanescent waves and improved by Vernier effect in coupled resonators.
Physics & Applied Physics
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). This paper was published in Proceedings of SPIE- Laser Resonators, Microresonators, and Beam Control XVI and is made available as an electronic reprint (preprint) with permission of SPIE. The paper can be found at the following official DOI: [http://dx.doi.org/10.1117/12.2036890]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.