Efficient coupling of light into photonic crystal waveguides using chirped photonic crystal tapers

Joshi, Neetu; Janyani, Vijay

doi:10.1007/s12596-009-0020-y

Cited by 1 publication

(4 citation statements)

References 32 publications

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“…It can be seen from In the following, the effect of the input width, the output width, and the length of the taper on the transmission is investigated. The main function of a photonic crystal taper is the transformation from a large cross-section fiber to a small cross section PCWG [11]. Figure 7a presents the transmission power versus the input width at a fixed length and the output width.…”

Section: Optimization Of Geometrical Parametersmentioning

confidence: 99%

“…The normalized frequency is in the range of 0.276-0.455( / ) which has a good agreement with the dispersion diagram presented in Figure 1a. This bandgap is our region of interest because working in this region reduces the coupling loss due to the bulk of photonic crystals [11]. The butt coupling together with the transmission spectrum The same optimization study has been done for the taper with square lattice (type 1).…”

Section: Investigation Of Transmission Spectrummentioning

confidence: 99%

“…It provides smooth mode profile conversion and in addition, it changes the modal properties yielding a higher coupling efficiency. Furthermore, the PhC tapering of a PCWG mode results in a reduction of the group velocity [ 10 , 11 ]. Slow light enhances the light-matter interaction.…”

Section: Introductionmentioning

confidence: 99%

“…An adiabatic transmission can occur if the operating mode is propagating (nonevanescent) and guided at every point in the taper [ 15 ]. The chirping of the PhC geometry can be done by two approaches, lattice distortion of a properly structured crystal arrangement or gradual change in the size of PhC elements [ 6 , 11 ]. The size changing needs highly accurate lithography to control the element size accurately.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Curved Shape Photonic Crystal Taper for Highly Efficient Mode Coupling

Jannesari

Grille

Consani

et al. 2021

Sensors

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The design and modeling of a curved shape photonic crystal taper consisting of Si rods integrated with a photonic crystal waveguide are presented. The waveguide is composed of a hexagonal lattice of Si rods and optimized for CO2 sensing based on absorption spectroscopy. We investigated two different approaches to design a taper for a photonic crystal waveguide in a hexagonal lattice of silicon rods. For the first approach (type 1), the taper consists of a square lattice taper followed by a lattice composed of a smooth transition from a square to a hexagonal lattice. In the second approach (type 2), the taper consists of a distorted hexagonal lattice. Different shapes, such as convex, concave, and linear, for the curvature of the taper were considered and investigated. The structure of the taper was improved to enhance the coupling efficiency up to 96% at a short taper length of 25 lattice periods. The finite-difference time-domain (FDTD) technique was used to study the transmission spectrum and the group index. The study proves the improvement of coupling using a curved shape taper. Controlling the group index along the taper could be further improved to enhance the coupling efficiency in a wider spectral range.

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Section: Optimization Of Geometrical Parametersmentioning

confidence: 99%

Section: Investigation Of Transmission Spectrummentioning

confidence: 99%