期刊
ACS NANO
卷 9, 期 5, 页码 5018-5026出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn5072045
关键词
nonlinear optics; second-harmonic generation; CdS nanobelt; plasmonic nanocavity; Fabry-Perot resonance; SHG enhancement; plasmons
类别
资金
- NTU [M4080514]
- SPMS Collaborative Research Award [M4080536]
- Ministry of Education (MOE) [MOE2011-T2-2-051, MOE2013-T2-1-081]
- Singapore National Research Foundation through the Competitive Research Programme [NRF-CRP5-2009-04]
- Singapore-Berkeley Research Initiative for Sustainable Energy (SinBerRISE) CREATE Programme
- Singapore National Research Foundation through an NRF fellowship [NRF-RF2009-06]
- Competitive Research Program grant [NRF-CRP-6-2010-2]
- Ministry of Education AcRF Tier 2 grant [MOE2011-T2-2-051]
- MOE Tier1 grant [MOE2013-T1-002-232]
- Nanyang Technological University [M58113004]
Semiconductor nanostructures (e.g., nanowires and nanobelts) hold great promise as subwavelength coherent light sources, nonlinear optical frequency converters, and all-optical signal processors for optoelectronic applications. However, at such small scales, optical second-harmonic generation (SHG) is generally inefficient. Herein, we report on a straightforward strategy using a thin Au layer to enhance the SHG from a single CdS nanobelt by 3 orders of magnitude. Through detailed experimental and theoretical analysis, we validate that the augmented SHG originates from the mutual intensification of the local fields induced by the plasmonic nanocavity and by the reflections within the CdS Fabry-Perot resonant cavity in this hybrid semiconductor metal system. Polarization-dependent SHG measurements can be employed to determine and distinguish the contributions of SH signals from the CdS nanobelt and gold film, respectively. When the thickness of gold film becomes comparable to the skin depth, SHG from the gold film can be clearly observed. Our work demonstrates a facile approach for tuning the nonlinear optical properties of mesoscopic, nanostructured, and layered semiconductor materials.
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