Ultralow threshold laser action from toroidal polymer microcavity

Date
2009
Advisor
Instructor
Source Title
Applied Physics Letters
Print ISSN
0003-6951
Electronic ISSN
Publisher
American Institute of Phycsics
Volume
94
Issue
20
Pages
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

We report laser action from a toroidal microcavity coated with π-conjugated polymer. An ultralow threshold value of ∼200 pJ/pulse is achieved by free space excitation in ambient conditions. This is the lowest threshold energy obtained in microtoroid lasers by free space excitation. The effective refractive index of the polymer, extracted from Fourier analysis of emission spectra, is 1.787, which is very close to measured value of 1.790 indicating that laser modes are located around the circumference of the cavity as whispering gallery resonances. © 2009 American Institute of Physics.

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Keywords
Ambient conditions, Effective refractive index, Emission spectrums, Free space, Laser action, Polymer microcavity, Threshold energy, Toroidal microcavity, Ultra-low threshold, Whispering gallery, Emission spectroscopy, Fourier analysis, Microcavities, Organic polymers, Polymers, Refractive index, Lasers
Citation
Published Version (Please cite this version)