Direct Backward Third-Harmonic Generation in Nanostructures
Resource
Optics Express, 18(7), 7397-7406
Journal
Optics Express
Journal Volume
18
Journal Issue
7
Pages
7397-7406
Date Issued
2010
Date
2010
Author(s)
Chang, Chieh-Feng
Chen, Hsing-Chao
Liu, Wei-Rein
Hsieh, Wen-Feng
Hsu, Chia-Hung
Chen, Chao-Yu
Chang, Fu-Hsiung
Yu, Che-Hang
Abstract
Direct-backward third harmonic generation (DBTHG) has been regarded as negligible or even inexistent due to the large value of wave-vector mismatch. In the past, BTHG signals were often interpreted as back-reflected or back-scattered forward-THG (FTHG). In this paper, we theoretically and experimentally demonstrate that backward third harmonic waves can be directly generated, and that their magnitude can be comparable with FTHG in nanostructures. Experimental data of DBTHG from ZnO thin films, CdSe quantum dots and Fe(3)O(4) nanoparticles agree well with simulation results based on the Green's function. An integral equation was also derived for fast computation of DBTHG in nano films. Our investigation suggests that DBTHG can be a potentially powerful tool in nano-science research, especially when combined with FTHG measurements.
Type
journal article
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