材料科学
激光器
包层(金属加工)
光电子学
折射率
氮化硅
光学
光子晶体
硅
光子学
作者
Simone Iadanza,Jesus Hernan Mendoza-Castro,Taynara Oliveira,Sharon M. Butler,Alessio Tedesco,Giuseppe Giannino,Bernhard Lendl,Marco Grande,Liam O’Faolain
出处
期刊:Nanophotonics
[De Gruyter]
日期:2022-08-10
卷期号:11 (18): 4183-4196
标识
DOI:10.1515/nanoph-2022-0245
摘要
Abstract In this paper we show a novel design of high Q-factor silicon nitride (SiN) 1D photonic crystal (PhC) cavities side-coupled to curved waveguides, operating with both silica and air cladding. The engineering of the etched 1D PhC cavity sidewalls angle allows for high Q-factors over a wide range of upper cladding compositions, and the achievement of the highest calculated Q-factor for non-suspended asymmetric SiN PhC structures. We show the employment of these type of SiN PhC cavities in hybrid external cavity laser (HECL) configuration, with mode-hop free single mode laser operation over a broad range of injected currents (from 25 mA to 65 mA), milliwatts of power output (up to 9 mW) and side-mode suppression ratios in the range of 40 dB. We demonstrate the operation of these devices as compact and energy efficient optical sensors that respond to refractive index changes in the surrounding medium the measurement of sodium chloride (from 0% to 25%) and sucrose (from 0% to 25%) in aqueous solution. In HECL configuration, the RI sensor exhibits a 2 orders of magnitude improvement in detection limit compared to the passive microcavity. We also discuss the possibility for applying these devices as novel transducers for refractive index changes that are induced by analyte specific absorption of infrared radiation by the target analytes present in gas or liquid phase.
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