Vertical cavity lasing from melt-grown crystals of cyano-substituted thiophene/phenylene co-oligomer

Journal Article · Mon Oct 19 04:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4934588· OSTI ID:22485951

Tanaka, Yosuke; Yanagi, Hisao ^[1]; Goto, Kaname; Yamashita, Kenichi; Yamao, Takeshi; Hotta, Shu ^[2]; Sasaki, Fumio ^[3]

---

1. Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192 (Japan)
2. Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585 (Japan)
3. Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

Vertical-cavity organic lasers are fabricated with melt-grown crystals of a cyano-substituted thiophene-phenylene co-oligomer. Due to lying molecular orientation, surface-emitting lasing is achieved even in the half-cavity crystal grown on a distributed Bragg reflector (DBR) under optical pumping at room temperature. Anticrossing splits in angle-resolved photoluminescence spectra suggest the formation of exciton-polaritons between the cavity photons and the confined Frenkel excitons. By constructing the full-cavity structure sandwiched between the top and bottom DBRs, the lasing threshold is reduced to one order, which is as low as that of the half cavity. Around the threshold, the time profile of the full-cavity emission is collapsed to a pulsed shape accompanied by a finite turn-on delay. We discuss these observed characteristics in terms of a polariton contribution to the conventional photon lasing.

• OSTI ID: 22485951
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 107; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRYSTALS
EXCITONS
LASERS
OPTICAL PUMPING
ORIENTATION
PHOTOLUMINESCENCE
PHOTONS
POLARONS
POLYCYCLIC SULFUR HETEROCYCLES
PULSE SHAPERS
SPECTRA
SURFACES
TEMPERATURE RANGE 0273-0400 K
THIOPHENE