One-way diffraction grating

Lockyear, Matthew J.; Hibbins, Alastair P.; White, Kevin; Sambles, J. R.

doi:10.1103/physreve.74.056611

Cited by 73 publications

(76 citation statements)

References 8 publications

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“…This case is similar to that demonstrated for the nonsymmetric microwave metallic gratings, where different periods at the two sides are created by a proper branching of the thin slit waveguides (Lockyear, 2006), and in the nonsymmetric gratings that contain the Drude material layers, while the periods are different owing to the one-side corrugations (Serebryannikov&Ozbay, 2009). In all the figures, the most representative ranges with Two more cases are shown in Figs.…”

Section: Forward Vs Backward Transmissionsupporting

confidence: 54%

Basics of the photonic crystal gratings

Serebryannikov¹

2012

Photonic Crystals - Introduction, Applications and Theory

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Section: Forward Vs Backward Transmissionsupporting

confidence: 54%

Basics of the photonic crystal gratings

Serebryannikov¹

2012

Photonic Crystals - Introduction, Applications and Theory

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“…In recent years, the interest in the asymmetric effects arising in the Lorentz reciprocal structures with broken spatial inversion symmetry has been growing [1][2][3][4][5]. Several mechanisms of asymmetric transmission have been suggested, whose common feature is that the additional transmission and reflection channels must be open at one of the two opposite incidence directions.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, they cannot be realized in a two-port system that is made of linear, isotropic, and passive materials. The known mechanisms include those inspired by diffractions [1,2,6,7] and polarization conversion [5,8,9]. The mechanisms realizable in the structures that (may) support surface waves should also be mentioned [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

2014

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One-way absorption can be obtained at terahertz frequencies in low-profile rod-type and multilayer dielectric structures with broken spatial inversion symmetry, which contain either a rod layer or an ultrathin homogeneous layer made of a polar dielectric. Perfect absorption for one of the two opposite incidence directions and perfect reflection for the other one are observed at the edge of the polaritonic gap in a wide range of the incident angle variation, when the thickness of the entire structure is of the order of the incident wavelength. Moreover, this regime appears in a wide frequency range, in which the forward-to-backward absorption contrast is strong. The exploited mechanism is connected with the parameter adjustment that enables the location of the polaritonic gap of the polar dielectric, of which the lossy part of the structure is made, inside the stop band arising due to the periodicity of the lossless part of the structure that is made of a nondispersive dielectric. It also exploits absorption enhancement in the lossy part by backing it with the highly reflecting lossless part, which has alternating stop and pass bands.

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“…[6], and quantum dots [7]. Recent reports observe one-way transmission behavior in the absence of nonlinear or anisotropic materials [1,[8][9][10][11]. Lockyear et al…”

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confidence: 99%

Ultrahigh Contrast One-Way Optical Transmission Through a Subwavelength Slit

2012

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We computationally demonstrate one-way optical transmission characteristics of a subwavelength slit. We comparatively study the effect in single layer and double layer metallic corrugations. We also investigate the effect of a dielectric spacer layer between double corrugations to control the volumetric coupling of plasmon and optical modes. We computationally show unidirectional transmission behavior with an ultrahigh contrast ratio of 53.4 dB at λ01.56 μm. Volumetric coupling efficiency through the nanoslit strongly depends on the efficient excitation of both the surface plasmon resonance and metal-insulator-metal waveguide modes. We show that the behavior is tunable in a wide spectral range. [6], and quantum dots [7]. Recent reports observe one-way transmission behavior in the absence of nonlinear or anisotropic materials [1,[8][9][10][11]. Lockyear et al. Keywords[8] showed that it is possible to implement one-way transmission devices operating at the microwave frequencies using asymmetric rectangular gratings. In a double layer asymmetric grating structure, the transmission of one direction is improved by a resonant diffraction grating while the periodicity of the opposite orientation sustains only higher order modes [8]. Utilizing a double layer diffraction grating structure, Zen et al. [9] demonstrated that contrast ratios above 100 can be achieved.Excitation of surface plasmon resonances by metallic gratings can be used to achieve enhanced transmission [12]. One-way transmission devices operating at telecommunication standard wavelengths have been realized exploiting plasmonic modes including the use of tunable plasmon resonances obtained on rectangular metallic gratings coated with nonlinear materials [13], asymmetric plasmonic gratings integrated in slot waveguides [14], and asymmetric rectangular diffraction gratings [1]. It was shown that transmission through subwavelength apertures can be enhanced by metallic gratings at the illuminated side of a subwavelength aperture which enables the coupling of surface plasmon modes with the aperture [15]. Moreover, both theoretical [10] and experimental [11] demonstrations of one-way transmission characteristics of asymmetric rectangular gratings coupled with a subwavelength aperture have been accomplished at microwave frequencies.In this paper, we present the design and analysis of a oneway transmission device operating at the telecommunication standard wavelengths with an ultrahigh contrast ratio. Our design achieves strong unidirectional characteristics by exploiting the one-way transmission property of double layer gratings coupled with the extraordinary transmission through a subwavelength slit. We also investigate the effect of the resonant coupling of the modes of the front-side and back-side diffraction gratings on one-way transmission characteristics. We demonstrate that by controlling the coupling between the gratings with a separating dielectric layer, an ultrahigh contrast ratio can be achieved.

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One-way diffraction grating

Cited by 73 publications

References 8 publications

Basics of the photonic crystal gratings

Basics of the photonic crystal gratings

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

Ultrahigh Contrast One-Way Optical Transmission Through a Subwavelength Slit

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