Laser oscillations of whispering gallery modes in thiophene/phenylene co-oligomer microrings

Laser oscillation of whispering gallery modes was observed in microring structures of semiconducting thiophene/phenylene co-oligomer (TPCO) crystals at room temperature. Microring structures were formed by dry etching from thin film crystals of TPCO. The thresholds for the laser oscillation of a mic...

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Bibliographic Details
Published in:Applied physics letters 2007-07, Vol.91 (2)
Main Authors: Fujiwara, Seiji, Bando, Kazuki, Masumoto, Yasuaki, Sasaki, Fumio, Kobayashi, Shunsuke, Haraichi, Satoshi, Hotta, Shu
Format: Article
Language:English
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Summary:Laser oscillation of whispering gallery modes was observed in microring structures of semiconducting thiophene/phenylene co-oligomer (TPCO) crystals at room temperature. Microring structures were formed by dry etching from thin film crystals of TPCO. The thresholds for the laser oscillation of a microring and a thin film crystal are 200 and 1400μJ∕cm2 for picosecond excitation, respectively. Therefore, the threshold for the microring was reduced to 1∕7 of that for the thin film crystal. The dramatic reduction of threshold clearly demonstrates the importance of microcavity in making efficient organic semiconductor lasers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2755925