Porosification-reduced optical trapping of silicon nanostructures

Wai Keung To, Junxue FU, Xiongbo Yang, V. A.L. Roy, Jeffery HUANG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Metal-assisted chemical etching (MACE) was carried out to fabricate solid silicon nanowires (s-SiNWs) and mesoporous silicon nanowires (mp-SiNWs). Total reflection and transmission were measured using an integrated sphere to study optical properties of the MACE-generated silicon nanostructures. Without NW aggregation, mp-SiNWs vertically standing on a mesoporous silicon layer trap less light than s-SiNWs over a wavelength range of 400-800 nm, owing to porosification-enhanced optical scattering from the rough inner surfaces of the mesoporous silicon skeletons. Porosification substantially weakens the NW mechanical strength; hence the elongated mp-SiNWs aggregate after 30 min etching and deteriorate optical trapping.

Original languageEnglish
Pages (from-to)5835-5839
Number of pages5
JournalNanoscale
Volume4
Issue number19
DOIs
Publication statusPublished - 2012

Scopus Subject Areas

  • Materials Science(all)

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