Browsing by Author "Yu, Che-Hang"

Now showing 1 - 2 of 2

Direct Backward Third Harmonic Generation in Nanostructures
(2010-01-01)
Chang, Chieh-Feng
;
Chen, Hsing-Chao
;
Chen, Miin-Jang
;
Liu, Wei-Rein
;
Hsieh, Wen-Feng
We theoretically and experimentally demonstrated that direct backward third harmonic generation (THG) waves can be comparable in magnitude with forward THG waves in nanostructures, such as ZnO thin films and nanoparticles of CdSe and Fe3O4. (C) 2010 Optical Society of America
Direct backward third-harmonic generation in nanostructures
(2010-03-29)
Chang, Chieh-Feng
;
Chen, Hsing-Chao
;
Chen, Miin-Jang
;
Liu, Wei-Rein
;
Hsieh, Wen-Feng
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. (C) 2010 Optical Society of America