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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 7397–7406

Direct backward third-harmonic generation in nanostructures

Chieh-Feng Chang, Hsing-Chao Chen, Miin-Jang Chen, Wei-Rein Liu, Wen-Feng Hsieh, Chia-Hung Hsu, Chao-Yu Chen, Fu-Hsiung Chang, Che-Hang Yu, and Chi-Kuang Sun  »View Author Affiliations

Optics Express, Vol. 18, Issue 7, pp. 7397-7406 (2010)

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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 Fe3O4 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.

© 2010 OSA

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Nonlinear Optics

Original Manuscript: January 5, 2010
Manuscript Accepted: February 7, 2010
Published: March 25, 2010

Chieh-Feng Chang, Hsing-Chao Chen, Miin-Jang Chen, Wei-Rein Liu, Wen-Feng Hsieh, Chia-Hung Hsu, Chao-Yu Chen, Fu-Hsiung Chang, Che-Hang Yu, and Chi-Kuang Sun, "Direct backward third-harmonic generation in nanostructures," Opt. Express 18, 7397-7406 (2010)

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