Abstract

We fabricated tantalum pentoxide (Ta2O5) channel waveguides and used them to experimentally demonstrate higher-order mode supercontinuum (SC) generation. The Ta2O5 waveguide has a high nonlinear refractive index which was in an order magnitude of 10–14 cm2/W and was designed to be anomalously dispersive at the pumping wavelength. To the best of our knowledge, this is the first time a higher-order mode femtosecond pump based broadband SC has been measured from a nonlinear waveguide using the phase-matching method. This enabled us to demonstrate a SC spectrum spanning from 842 to 1462 nm (at − 30 dB), which corresponds to 0.83 octaves, when using the TM10 waveguide mode. When using the TE10 mode, the SC bandwidth is slightly reduced for the same excitation peak power. In addition, we theoretically estimated and discussed the possibility of using the broadband higher-order modes emitted from the Ta2O5 waveguide for trapping nanoparticles. Hence, we believe that demonstrated Ta2O5 waveguide are a promising broadband light source for optical applications such as frequency metrology, Raman spectroscopy, molecular spectroscopy and optical coherence tomography.

Details

Title
Higher order mode supercontinuum generation in tantalum pentoxide (Ta2O5) channel waveguide
Author
Fan Ranran 1 ; Yuan-Yao, Lin 2 ; Chang, Lin 3 ; Boes, Andreas 4 ; Bowers, John 3 ; Jia-Wei, Liu 1 ; Chao-Hong, Lin 1 ; Te-Keng, Wang 1 ; Qiao Junpeng 1 ; Hao-Chung, Kuo 5 ; Gong-Ru, Lin 6 ; Min-Hsiung, Shih 7 ; Yung-Jr, Hung 1 ; Yi-Jen, Chiu 1 ; Chao-Kuei, Lee 8 

 National Sun Yat-Sen University, Department of Photonics, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758) 
 National Sun Yat-Sen University, Department of Photonics, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758); National Sun Yat-Sen University, Center of Crystal Research, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758) 
 University of California, Santa Barbara (UCSB), Department of Electrical and Computer Engineering, Santa Barbara, USA (GRID:grid.133342.4) (ISNI:0000 0004 1936 9676) 
 University of California, Santa Barbara (UCSB), Department of Electrical and Computer Engineering, Santa Barbara, USA (GRID:grid.133342.4) (ISNI:0000 0004 1936 9676); RMIT University, School of Engineering, Melbourne, Australia (GRID:grid.1017.7) (ISNI:0000 0001 2163 3550) 
 National Chiao Tung University, Department of Photonics, Hsinchu 300, Taiwan (GRID:grid.260539.b) (ISNI:0000 0001 2059 7017) 
 National Taiwan University, Graduate Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, Taipei, Taiwan (GRID:grid.19188.39) (ISNI:0000 0004 0546 0241) 
 National Sun Yat-Sen University, Department of Photonics, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758); Academia Sinica, Research Center for Applied Sciences, Taipei, Taiwan (GRID:grid.28665.3f) (ISNI:0000 0001 2287 1366) 
 National Sun Yat-Sen University, Department of Photonics, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758); National Sun Yat-Sen University, Center of Crystal Research, Kaohsiung, Taiwan (GRID:grid.412036.2) (ISNI:0000 0004 0531 9758); Academia Sinica, Research Center for Applied Sciences, Taipei, Taiwan (GRID:grid.28665.3f) (ISNI:0000 0001 2287 1366) 
Publication year
2021
Publication date
2021
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2511565353
Copyright
© The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.