期刊
SCIENTIFIC REPORTS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep05902
关键词
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资金
- JSPS/MEXT, Japan [25708020, 25107507]
- Industrial Technology Research Grant Program (NEDO, Japan)
- Cooperative Research Program of Network Joint Research Center for Materials and Devices''
- Asahi Glass Foundation
- Tokuyama Science Foundation
- University of Tsukuba
- Grants-in-Aid for Scientific Research [25107507, 25708020] Funding Source: KAKEN
Confinement of light inside an active medium cavity can amplify emission. Whispering gallery mode (WGM) is one of mechanisms that amplifies light effectively by confining it inside high-refractive-index microstructures, where light propagates along the circumference of a sphere via total internal reflection. Here we show that isolated single microspheres of 2-10 mu m diameter, formed from self-assembly of pi-conjugated alternating copolymers, display WGM photoemission induced by laser pumping. The wavelengths of the emission peaks depend sensitively on the sphere size, position of the excitation spot and refractive index of each polymer. The Q-factor increases with increasing sphere diameter and displays a linear correlation with the reciprocal radius, indicating that the small curvature increases the efficacy of the total internal reflection. WGM photoemission from pi-conjugated polymer microspheres is unprecedented and may be of high technological impact since the microspheres fulfill the role of fluorophores, high-refractive-index media and resonators simultaneously, in addition to their simple fabrication process.
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