Low-loss pedestal Ta2O5 nonlinear optical waveguides
| Autor: | Ricardo E. Samad, Marco I. Alayo, Julian H. Sierra, Daniel O. Carvalho, Nilson Dias Vieira, Ricardo C. Rangel |
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| Přispěvatelé: | Universidade de São Paulo (USP), IPEN-CNEN/SP, Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Optical amplifier
Materials science business.industry Physics::Optics Nonlinear optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Two-photon absorption Atomic and Molecular Physics and Optics 010309 optics AMPLIFICADORES ÓPTICOS Nonlinear system Pedestal Optics 0103 physical sciences 0210 nano-technology Self-phase modulation business Refractive index Doppler broadening |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Made available in DSpace on 2020-12-12T01:10:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) In this work, we investigate a pedestal tantalum oxide (Ta2O5) material platform for integrated nonlinear optics (NLO). In order to achieve low propagation losses with this material, pedestal waveguides with Ta2O5 cores were designed. The nonlinear refractive index n2 of this new platform was obtained by measuring the amount of spectral broadening due to self-phase modulation (SPM) of 23 fs optical pulses at 785 nm propagating through the waveguides. In this manner, a nonlinear index of (5.8 ± 2.0) × 10−19 m2W−1 was found for this material, which is in good agreement with values reported in related works where strip waveguides were used for a similar purpose. Furthermore, due to the pedestal configuration, propagation losses as low as 1.6 dB·cm−1 for narrow waveguides and 0.1 dB·cm−1 for large waveguides were obtained. Finite element method (FEM) mode analysis was performed to calculate the mode characteristics, as well as the effective areas of the waveguides. The high nonlinear and linear refractive indices, wide bandgap and low propagation losses make this platform ideal for applications extending from the visible into the mid-IR regions of the optical spectrum. Due the large gap, Ta2O5 should have low two photon absorption at the near-IR as well. Polytechnic School University of São Paulo (USP) Center for Lasers and Applications IPEN-CNEN/SP Telecommunications Department São Paulo State University (UNESP) Telecommunications Department São Paulo State University (UNESP) CNPq: 305447/2017-3 CNPq: 32088/2018-0 |
| Databáze: | OpenAIRE |
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