Higher order mode supercontinuum generation in tantalum pentoxide (Ta2O5) channel waveguide

Ranran Fan, Yuan Yao Lin*, Lin Chang, Andreas Boes, John Bowers, Jia Wei Liu, Chao Hong Lin, Te Keng Wang, Junpeng Qiao, Hao-Chung Kuo, Gong Ru Lin, Min Hsiung Shih, Yung Jr Hung, Yi Jen Chiu, Chao Kuei Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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.

Original languageEnglish
Article number7978
Pages (from-to)1-11
Number of pages11
JournalScientific reports
Issue number1
StatePublished - 12 Apr 2021


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