Effects of structural perturbation on the optical properties of waveguide grating structures

Jingjuan Li; Xinping Zhang; Li Wang

doi:10.1117/12.978640

15 October 2012 Effects of structural perturbation on the optical properties of waveguide grating structures

Jingjuan Li, Xinping Zhang, Li Wang

Proceedings Volume 8418, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems; 841811 (2012) https://doi.org/10.1117/12.978640
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

In the waveguide grating structures (WGS), strong resonance between the diffraction waves and waveguide modes will result in a narrow peak in the extinction spectrum. In this article, a plane-wave transfer matrix method is used to investigate quantitatively the influence of the perturbation in the structural parameters on the narrow-band optical response of the WGS. These parameters include the modulation depth and the duty cycle of the grating structures, the thickness of the uniform intermediate layer between the waveguide and the grating structures. Numerical results and theoretical analyses indicate that the adjustment of the tuning range of the resonant signals can be realized by optimizing the relevant parameters. For example, the resonant signal shifts to longer wavelengths with increasing the modulation depth or the duty cycle of the grating. The intermediate layer between the grating and waveguide will results in multiple resonant modes in the extinction spectra and all of these signals shift to the longer wavelengths with increasing this extra layer. These results can be used as a guidance for the applications of the WGS and is important for the applications of the WGS or the waveguided metallic grating structures in sensors and optical switch.

Citation Download Citation

Jingjuan Li, Xinping Zhang, and Li Wang "Effects of structural perturbation on the optical properties of waveguide grating structures", Proc. SPIE 8418, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems, 841811 (15 October 2012); https://doi.org/10.1117/12.978640

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KEYWORDS

Waveguides

Waveguide modes

Refractive index

Polarization

Photoresist materials

Diffraction gratings

Modulation

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