Abstract
Microdisk and microring lasers of the organic semiconductor material thiophene/phenylene co-oligomer (TPCO) have been fabricated on Si/SiO2 substrates. Laser emission with the whispering gallery modes (WGM) is observed in 0-1 vibration transitions. Comparing with the bulk film parts, a few times reduction of the lasing threshold has been observed in microdisks. Microring lasing threshold is reduced further when the width of the waveguide is less than 1 μm. WGM with waveguide confinement is supposed to contribute to the decrease of the threshold.
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