Tapered couplers for efficient interfacing between dielectric and photonic crystal waveguides

Mekis, Attila; Joannopoulos, John D.

doi:10.1109/50.927519

Cited by 133 publications

(70 citation statements)

References 12 publications

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“…Therefore, the coupling efficiency predicted by this new structure is comparable with the better ones reported in the literature; Spuhler et al [15] proposed an inverse designed waveguide to fiber coupler with an efficiency improvement of 2 dB per converter. References [16]- [18] report different tapered waveguide couplers that exceed a predicted coupling efficiency of 90%. Finally, the J-coupler proposed by Prater et al [19] predicted a coupling efficiency of 91%.…”

Section: B Pc Waveguide Couplermentioning

confidence: 99%

Inverse design of photonic crystal devices

Håkansson

Sánchez‐Dehesa

Sánchis

2005

IEEE J. Select. Areas Commun.

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Abstract-This paper deals with the inverse design in the field of photonic crystal (PC)-based devices. Here, an inverse method containing a fast and accurate simulation method integrated with a competent optimization method is presented. Two designs yielded from this conjunction of multiple scattering theory with a genetic algorithm are analyzed. The potential of this approach is illustrated by designing a lens that has a very low F-number (F = 0 47) and a conversion ratio of 11:1. We have also designed a coupler device that introduces the light from an optical fiber into a PC-based waveguide with a predicted coupling efficiency that exceeds 87%.Index Terms-Genetic algorithm (GA), inverse design (ID), multiple scattering theory, optical fiber, photonic crystals (PCs), photonic devices, PC waveguide, spot-size converter.

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Section: B Pc Waveguide Couplermentioning

confidence: 99%

Inverse design of photonic crystal devices

Håkansson

Sánchez‐Dehesa

Sánchis

2005

IEEE J. Select. Areas Commun.

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“…It should be emphasized that reducing the ridge-access width, with the aim of direct coupling to W1, will only strangle the mode and increase the losses by coupling to the numerous radiation and lossy modes in the substrate unless the tapered part of the ridge is included within the PCW. 12,13 Such an approach is difficult to implement when the PC is an array of air holes within a semiconductor material, instead of dielectric rods in air. We f irst validate the taper eff iciency experimentally by measuring the ref lected power at the transition when coupling from W3 to W1.…”

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confidence: 99%

Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths

et al. 2002

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“…When K= 0.6 ∼ 0.9, the dispersion relation of the infinite slab WG is similar to that of the infinite PC WG. Such situation was called k-matching (wavevector matching) by Mekis et al 34,35 as a mechanism to reduce the reflection from the joint of a distributed Bragg reflector WG and a 2D PC WG with square lattice of rods. On the other hand, the exactly derived renormalized Fresnel coefficients of a semi-infinite 1D PC did not include Bloch wavevector explicitly.…”

Section: B Semi-infinite 2d Line-defect Pc Waveguidementioning

confidence: 99%

Immittance matching for multidimensional open-system photonic crystals

et al. 2003

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An electromagnetic (EM) Bloch wave propagating in a photonic crystal (PC) is characterized by the immittance (impedance and admittance) of the wave. The immittance is used to investigate transmission and reflection at a surface or an interface of the PC. In particular, the general properties of immittance are useful for clarifying the wave propagation characteristics. We give a general proof that the immittance of EM Bloch waves on a plane in infinite one-and two-dimensional (2D) PCs is real when the plane is a reflection plane of the PC and the Bloch wavevector is perpendicular to the plane. We also show that the pure-real feature of immittance on a reflection plane for an infinite three-dimensional PC is good approximation based on the numerical calculations. The analytical proof indicates that the method used for immittance matching is extremely simplified since only the real part of the immittance function is needed for analysis without numerical verification. As an application of the proof, we describe a method based on immittance matching for qualitatively evaluating the reflection at the surface of a semi-infinite 2D PC, at the interface between a semiinfinite slab waveguide (WG) and a semi-infinite 2D PC line-defect WG, and at the interface between a semi-infinite channel WG and a semi-infinite 2D PC slab line-defect WG.

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Tapered couplers for efficient interfacing between dielectric and photonic crystal waveguides

Cited by 133 publications

References 12 publications

Inverse design of photonic crystal devices

Inverse design of photonic crystal devices

Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths

Immittance matching for multidimensional open-system photonic crystals

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