Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3141730
Keywords
Fourier transform optics; microcavity lasers; optical polymers; whispering gallery modes
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Funding
- TUBITAK [106T348, 106G090]
- Turkish Academy of Sciences Distinguished Young Scientist Award (TUBA GEBIP)
- UNAM-Institute of Materials Science and Nanotechnology
- State Planning Organization of Turkey through the National Nanotechnology Research Center Project
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We report laser action from a toroidal microcavity coated with pi-conjugated polymer. An ultralow threshold value of similar to 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.
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