Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide

Qingyang Du; Zhengqian Luo; Huikai Zhong; Yifei Zhang; Yizhong Huang; Tuanjie Du; Wei Zhang; Tian Gu; Juejun Hu

doi:doi:10.1364/PRJ.6.000506

Photonics Research, 2018, 6 (6): 06000506, Published Online: Jul. 2, 2018

Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide Download： 767次

Qingyang Du ¹Zhengqian Luo ^2,*Huikai Zhong ^1,3Yifei Zhang ¹Yizhong Huang ²Tuanjie Du ²Wei Zhang ⁴Tian Gu ¹Juejun Hu ¹

Author Affiliations

¹ Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

² Department of Electronic Engineering, Xiamen University, Xiamen 361005, China

³ College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

⁴ Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China

Figures & Tables

Fig. 1. (a) Refractive index dispersion of the Ge22Sb18Se60 glass film measured using ellipsometry; inset schematically depicts the waveguide structure. (b) Simulated GVD of GeSbSe waveguides with varying widths (W) and a fixed core thickness H=400 nm.

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Fig. 2. (a) Top-view optical micrograph of the zigzag GeSbSe waveguides; (b) SEM cross-sectional image of a 0.95 μm (W)×0.4 μm (H) GeSbSe waveguide. (c) Experimental setup of on-chip SC generation and sensing. (d) Block diagram of home-built femtosecond laser module (OC, optical coupler; WDM, wavelength division multiplexer; SA, graphene saturable absorber; PC, polarization controller).

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Fig. 3. SC spectra in GeSbSe waveguides: (a) SC spectra from waveguides with different widths W; when W=0.95 μm, the zero-dispersion point of the waveguide coincides with the pump wavelength; (b) SC generation of GeSbSe waveguides with the optimal geometry (W=0.95 μm, H=0.4 μm) and varying lengths; (c) SC spectra from a 21 mm long GeSbSe waveguide (W=0.95 μm, H=0.4 μm) at different pump power levels. The power quoted here represents the average optical power coupled into the waveguide.

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Fig. 4. (a) SC spectra measured on GeSbSe waveguides of different lengths L when immersed in chloroform; the triangle marks the optical absorption at 1695 nm calibrated using a benchtop UV-Vis spectrometer for an equivalent waveguide path length L=21 mm; (b) SC spectra taken on a 21 mm long GeSbSe waveguide immersed in CHCl₃–CCl₄ solutions of varying volume concentration ratios; (c) measured peak absorption at 1695 nm versus the GeSbSe waveguide length used in the experiment. The linear relation indicates that the classical Lambert’s law is obeyed; the inset shows the mode profile simulated by finite difference method.

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Qingyang Du, Zhengqian Luo, Huikai Zhong, Yifei Zhang, Yizhong Huang, Tuanjie Du, Wei Zhang, Tian Gu, Juejun Hu. Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide[J]. Photonics Research, 2018, 6(6): 06000506.

Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide Download： 767次

Fig. 1. (a) Refractive index dispersion of the Ge22Sb18Se60 glass film measured using ellipsometry; inset schematically depicts the waveguide structure. (b) Simulated GVD of GeSbSe waveguides with varying widths (W) and a fixed core thickness H=400 nm.

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Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide Download： 767次

Fig. 1. (a) Refractive index dispersion of the Ge22Sb18Se60 glass film measured using ellipsometry; inset schematically depicts the waveguide structure. (b) Simulated GVD of GeSbSe waveguides with varying widths (W) and a fixed core thickness H=400 nm.

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