Dual band filter based on subwavelength metal grating with groove caved in and waveguide layer below

Rui Hu; Yuzhang Liang; Lingxiao Xie; Mengdi Lu; Wei Peng

doi:10.1117/12.2071686

13 November 2014 Dual band filter based on subwavelength metal grating with groove caved in and waveguide layer below

Rui Hu, Yuzhang Liang, Lingxiao Xie, Mengdi Lu, Wei Peng

Proceedings Volume 9277, Nanophotonics and Micro/Nano Optics II; 92771N (2014) https://doi.org/10.1117/12.2071686
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

Interactions between different resonance modes in optoelectronic structures may introduce coupled modes that can be utilized to explore special optical functions that cannot be realized by conventional methods. A novel dual band filter based on sub-wavelength metal grating with groove caved in and waveguide layer below is proposed in this paper. The metal grating is caved with a groove in the middle of every metal trip, and a waveguide layer with higher refractive index is placed between the metal grating and glass substrate. Using the finite-difference time-domain (FDTD) method, we research the implied physical mechanism by investigating the transmission spectrum with the changing of the structural parameters and the electromagnetic field distributions at some specific wavelengths, such as peaks and valleys in the transmittance. In our simulation, we chose Ag as the grating material and Drude-Lorentz model is employ to describe the dielectric constant. It is found that the two resonance bands are determined by different structural parameters, which due to different mechanism, FP resonance and waveguide resonance, and we also take the groove cavity mode into account when the standing wave oscillates in the groove and result in the dips between two peaks. Besides, the most notable of these features is that the increase of the grating height doesn’t shift these two resonance wavelength at all, and groove parameters only move the first peak wavelength regularly, which could be an excellent candidate for dual band filter in the telecom wavelengths. Our proposed structure with subwavelength may provide potential applications in optoelectronic devices.

Citation Download Citation

Rui Hu, Yuzhang Liang, Lingxiao Xie, Mengdi Lu, and Wei Peng "Dual band filter based on subwavelength metal grating with groove caved in and waveguide layer below", Proc. SPIE 9277, Nanophotonics and Micro/Nano Optics II, 92771N (13 November 2014); https://doi.org/10.1117/12.2071686

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KEYWORDS

Waveguides

Metals

Optical filters

Solids

Transmittance

Finite-difference time-domain method

Dielectrics

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