Realization of multiphoton lasing from carbon nanodot microcavities

Wenfei Zhang, Yiqun Ni, Xuhui Xu, Wei Lu, Pengpeng Ren, Peiguang Yan, Chun Kit Siu, Shuangchen Ruan, Siu Fung Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

The use of organosilane chains to link carbon nanodots (CDs) through organosilane surface functional groups is proposed to improve the efficiency of multiphoton absorption. As a result, a large absorption coefficient of 1.16 × 10-6cm5per GW3is obtained and four-photon luminescence under 1900 nm excitation is observed from the CDs at room temperature. Furthermore, a CD laser, which demonstrates random lasing under three-photon (i.e. 1400 nm) excitation, can be realized by sandwiching a CD film between a quartz substrate and a dielectric mirror. The formation of strongly confined microcavities, which arise from the non-uniform distribution of refractive indices inside the CD film, is attributed to the realization of lasing emission.
Original languageEnglish
Pages (from-to)5957-5963
Number of pages7
JournalNanoscale
Volume9
Issue number18
DOIs
Publication statusPublished - 14 May 2017

ASJC Scopus subject areas

  • Materials Science(all)

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