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Title: Laser-induced greenish-blue photoluminescence of mesoporous silicon nanowires
Authors: Choi, Y.-R.
Zheng, M.
Bai, F.
Liu, J.
Tok, E.-S.
Huang, Z.
Sow, C.-H. 
Issue Date: 13-May-2014
Citation: Choi, Y.-R., Zheng, M., Bai, F., Liu, J., Tok, E.-S., Huang, Z., Sow, C.-H. (2014-05-13). Laser-induced greenish-blue photoluminescence of mesoporous silicon nanowires. Scientific Reports 4 : -. ScholarBank@NUS Repository.
Abstract: Solid silicon nanowires and their luminescent properties have been widely studied, but lesser is known about the optical properties of mesoporous silicon nanowires (mp-SiNWs). In this work, we present a facile method to generate greenish-blue photoluminescence (GB-PL) by fast scanning a focused green laser beam (wavelength of 532 nm) on a close-packed array of mp-SiNWs to carry out photo-induced chemical modification. The threshold of laser power is 5 mW to excite the GB-PL, whose intensity increases with laser power in the range of 5-105 mW. The quenching of GB-PL comes to occur beyond 105 mW. The in-vacuum annealing effectively excites the GB-PL in the pristine mp-SiNWs and enhances the GB-PL of the laser-modified mp-SiNWs. A complex model of the laser-induced surface modification is proposed to account for the laser-power and post-annealing effect. Moreover, the fast scanning of focused laser beam enables us to locally tailor mp-SiNWs en route to a wide variety of micropatterns with different optical functionality, and we demonstrate the feasibility in the application of creating hidden images.
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/srep04940
Appears in Collections:Staff Publications

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