Ultralow threshold laser action from toroidal polymer microcavity
Date
2009
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Source Title
Applied Physics Letters
Print ISSN
0003-6951
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American Institute of Phycsics
Volume
94
Issue
20
Pages
Language
English
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Journal Title
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Volume Title
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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