Coupling coefficients for trapezoidal gratings

Correc, P.

doi:10.1109/3.86

Cited by 21 publications

(3 citation statements)

References 6 publications

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“…Based on coupled waves theory [2], a perturbation analysis is used to obtain an expression of the coupling coefficient κ produced by the grating. We have used an analytic simplification [3] to evaluate κ as a function of the Bragg order, the duty cycle and the grating depth, as shown in figure 1. To optimize both modal discrimination and optical power, we have targeted a coupling coefficient κl around 1.25 [4].…”

Section: Modellingmentioning

confidence: 99%

Distributed-feedback GaSb-based laser diodes in the 2.3 to 3.3μm wavelength range

Gaimard

Nguyen-Ba

Larrue³

et al. 2014

SPIE Proceedings

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The development of a reliable, selective and sensitive technique for atmospheric trace gas concentrations monitoring is a critical challenge in science and engineering. Tunable single-frequency lasers in the mid-infrared wavelength range, working in continuous wave regime at room temperature can be used in absorption spectroscopy to identify and quantify several gases such as methane (greenhouse gas) and ethylene (food-processing). We report here on the design and development of 2 nd order distributed-feedback (DFB) antimonide-laser diodes in the 2.2 to 3.3µm wavelength range.We have chosen an index-coupled approach of the DFB filter. Two ways sere followed:-Side wall corrugation, based on an Inductively Coupled Plasma (ICP) Cl-based deep etching; -Buried grating, mainly based on an epitaxial regrowth procedure. Those processes are applied to structures grown by molecular beam epitaxy (MBE) on a GaSb substrate.We first present simulation analysis used to define the Bragg grating period -tied to emission wavelength-, the geometry chosen to optimize the modal discrimination, the tuning range and the optical power of the lasing mode. Next we report on the structure fabrication by molecular beam epitaxy. Then we describe the grating fabrication by holographic lithography. We carry on by an in-depth presentation of both processes and related results. We finally conclude this paper with a short discussion about the results and prospects.

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Section: Modellingmentioning

confidence: 99%

Distributed-feedback GaSb-based laser diodes in the 2.3 to 3.3μm wavelength range

Gaimard

Nguyen-Ba

Larrue³

et al. 2014

SPIE Proceedings

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show abstract

“…Actually, limited by the manufacture process, the grating profile cannot keep rectangle with periodicity in macro-or nano-scale, and it is mostly with profile similar to sinusoid, triangle, or trapezoid. [11][12][13][14][15] Therefore, investigating the influence of grating profile on the radiation characteristics will facilitate the practical application of this kind of THz radiation source. In this paper, the graphene SPPs enhanced THz radiation from graphene coated dielectric grating with arbitrary profile excited by an electron bunch is theoretically studied.…”

Section: Introductionmentioning

confidence: 99%

Tunable terahertz radiation from arbitrary profile dielectric grating coated with graphene excited by an electron beam

Zhao

Zhong

et al. 2015

Chinese Phys. B

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In this paper, the enhanced terahertz radiation transformed from surface plasmon polaritons, excited by a uniformly moving electron bunch, in a structure consisting of a monolayer graphene supported on a dielectric grating with arbitrary profile is investigated. The results show that the grating profile has significant influence on the dispersion curves and radiation characteristics including radiation frequency and intensity. The dependence of dispersion and radiation characteristics on the grating shape for both the symmetric and asymmetric gratings is studied in detail. Moreover, we find that, for an asymmetric grating with certain profile, there exist two different diffraction types, and one of the two types can provide higher radiation intensity comparing to the other one. These results will definitely facilitate the practical application in developing a room-temperature, tunable, coherent and miniature terahertz radiation source.

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“…As the number of partitioned layers increases, the coupling coefficient difference ratio is reduced drastically, and the coupling coefficient converges to a certain value. In the case of first-order gratings with a grating depth of 0.1 m, the ratio of the difference between the coupling coefficient , calculated by partitioning the grating region as five 5 uniform layers, and the coupling coefficient , calculated by 1 replacing the grating region as a single uniform layer, to is 1 less than 0.6% for trapezoidal gratings and less than 1.1% for triangular gratings. Figure 1 shows a schematic illustration of a five-layer slab waveguide with trapezoidal gratings.…”

Section: Introductionmentioning

confidence: 99%

Extended additional layer method of calculating the coupling coefficient of arbitrarily shaped gratings

Cho

Kim

Dagli

1997

Microw. Opt. Technol. Lett.

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Coupling coefficients for trapezoidal gratings

Cited by 21 publications

References 6 publications

Distributed-feedback GaSb-based laser diodes in the 2.3 to 3.3μm wavelength range

Distributed-feedback GaSb-based laser diodes in the 2.3 to 3.3μm wavelength range

Tunable terahertz radiation from arbitrary profile dielectric grating coated with graphene excited by an electron beam

Extended additional layer method of calculating the coupling coefficient of arbitrarily shaped gratings

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