Optimizing the design of GaAs/AlGaAs thin-film waveguides for integrated mid-infrared sensors

Markus Sieger; Boris Mizaikoff

doi:doi:10.1364/prj.4.000106

Photonics Research, 2016, 4 (3): 03000106, Published Online: Sep. 29, 2016

Optimizing the design of GaAs/AlGaAs thin-film waveguides for integrated mid-infrared sensors Download： 736次

Markus Sieger Boris Mizaikoff ^*

Author Affiliations

Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany

Figures & Tables

Fig. 1. Cross section of the simulation model (50 μm×50 μm) comprising a GaAs/AlGaAs waveguide with a 6 μm AlGaAs layer (optical buffer), a 6 μm GaAs layer (actual waveguide), and a 20 μm thick GaAs substrate. The width (w), the thickness of the absorbed layer (dl) simulating an analyte, and the refractive index of the outer medium (no) were varied during the simulations.

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Fig. 2. Dependence of the modal behavior on the width of the waveguide (A) for the amide region (1800–1600 cm−1), and (B) for the carbohydrate region (1200–1000 cm−1). (C) The fundamental guided TM00 mode of a 5 μm wide waveguide, and (D) the first-order TM01 mode of a 11 μm wide waveguide at a wavelength at 1700 cm−1 are also illustrated.

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Fig. 3. Exponential fit of the effective refractive index of a 13 μm wide waveguide at a wavelength at 1100 cm−1 as a function of the absorbing analyte layer thickness.

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Fig. 4. Linear fit of the effective refractive index of a 5 μm wide waveguide at a wavelength at 1700 cm−1 as a function of the refractive index of the outer medium.

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Fig. 5. (Top) Normalized electric field component along the center axis of a waveguide versus the waveguide width. Inset illustrates the waveguide section of the simulated electric field for a 5 μm wide waveguide at 1700 cm−1. (Bottom) Magnified view of the electric field above the waveguide surface (i.e., the evanescent field).

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Markus Sieger, Boris Mizaikoff. Optimizing the design of GaAs/AlGaAs thin-film waveguides for integrated mid-infrared sensors[J]. Photonics Research, 2016, 4(3): 03000106.

Optimizing the design of GaAs/AlGaAs thin-film waveguides for integrated mid-infrared sensors Download： 736次

Fig. 3. Exponential fit of the effective refractive index of a 13 μm wide waveguide at a wavelength at 1100 cm−1 as a function of the absorbing analyte layer thickness.

Fig. 4. Linear fit of the effective refractive index of a 5 μm wide waveguide at a wavelength at 1700 cm−1 as a function of the refractive index of the outer medium.

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Optimizing the design of GaAs/AlGaAs thin-film waveguides for integrated mid-infrared sensors Download： 736次

Fig. 3. Exponential fit of the effective refractive index of a 13 μm wide waveguide at a wavelength at 1100 cm−1 as a function of the absorbing analyte layer thickness.

Fig. 4. Linear fit of the effective refractive index of a 5 μm wide waveguide at a wavelength at 1700 cm−1 as a function of the refractive index of the outer medium.

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