Crescent shaped dielectric periodic structure for light manipulation

Kurt, Hamza; Turduev, Mırbek; Giden, İbrahim Halil

doi:10.1364/oe.20.007184

Cited by 23 publications

(9 citation statements)

References 46 publications

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“…This is usually represented by a flat equifrequency contour (EFC). Breaking the rotational symmetry of the lattice unit cell has shown to present new features in engineering the dispersion diagram among which is the high self-collimation and tilted EFCs [32]. This can be shown for the L-shape in the flat EFC presented in Fig.…”

Section: Self-collimation Of L-shapementioning

confidence: 90%

Chiral Surface Wave propagation with Anomalous Spin-momentum Locking

Kandil¹,

Bisharat²,

Sievenpiper³

2021

Preprint

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The ability to control the directionality of surface waves by manipulating its polarization has been of great significance for applications in spintronics and polarization-based optics. Surface waves with evanescent tails are found to possess an inherent in-plane transverse spin which is dependent on the propagation direction while an out-of-plane transverse spin does not naturally occur for surface waves and requires a specific surface design. Here, we introduce a new type of surface waves called chiral surface wave which has two transverse spins, an in-plane one that is inherent to any surface wave and an out-of-plane spin which is enforced by the design due to strong x-to-y coupling and broken rotational symmetry. The two transverse spins are locked to the momentum. Our study opens a new direction for metasurface designs with enhanced and controlled spin-orbit interaction by adding an extra degree of freedom to control the propagation direction as well as the transverse spin of surface waves.

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Section: Self-collimation Of L-shapementioning

confidence: 90%

Chiral Surface Wave propagation with Anomalous Spin-momentum Locking

Kandil¹,

Bisharat²,

Sievenpiper³

2021

Preprint

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“…Apart from the above-mentioned applications, by using the intrinsic dispersive characteristics of the low-symmetric PCs, different types of photonic devices such as beam routers, splitters, and deflectors can be realized [90]. Moreover, polarization-independent waveguide design can be implemented by PCs with reduced-symmetry [91].…”

Section: Potential Applications Based On Our Studiesmentioning

confidence: 99%

Reduced symmetry and analogy to chirality in periodic dielectric media

Giden

Turduev

Kurt

2014

J. Eur. Opt. Soc.-Rapid Publ.

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Much attention has been paid to photonic applications based on periodic media. Meanwhile, quasi-periodic and disordered media have extended the research domain and provided additional novelties for manipulating and controlling light propagation. This review article attempts to highlight the benefits of symmetry reduction in highly symmetric periodic photonic media, and applies the concept of chirality to all-dielectric materials arranged in special orders. Two-dimensional periodic structures known as photonic crystals (PCs) are highly symmetric in terms of structural patterns, due to the lattice types and shape of the elements occupying the PC unit-cell. We propose the idea of intentionally introducing reduced-symmetry, to search for anomalous optical characteristics so that these types of PCs can be used in the design of novel optical devices. Breaking either translational or rotational symmetries of PCs provides enhanced and additional optical characteristics such as creation of a complete photonic bandgap, wavelength demultiplexing, super-collimation, tilted self-collimation, and beam deflecting/routing properties. Utilizing these characteristics allows the design of several types of photonic devices such as polarization-independent waveguides, wavelength demultiplexers, beam deflectors, and routers. Moreover, reducing the symmetry in the PC unit-cell scale produces a novel feature in all-dielectric PCs that is known as chirality. On the basis of above considerations, it is expected that low-symmetric PCs can be considered as a potential structure in photonic device applications, due to the rich inherent optical properties, providing broadband operation, and being free of absorption losses.

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“…In order to implement the focusing effect, various notable approaches based on negative refraction [25], Fabry-Perot resonances [26], super-lenses [27], aperiodic metallic waveguide arrays [28], metamaterials [29], photonic nano-jets [30] have been proposed. On the other hand, the light guiding is achieved by using photonic-bandgap systems [31], slot-waveguides [32], plasmonic waveguides [33], coupled resonators [34] and dispersion-based optical routing [35,36] methods. Apart from these techniques, manipulation of light propagation behavior is further enhanced by introducing the concept of gradient-index (GRIN) materials.…”

Section: Introductionmentioning

confidence: 99%

Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures

Babayigit

Kurt

Turduev

2019

J. Phys. D: Appl. Phys.

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This study presents active beam steering and afocal zooming of light by incorporating liquid crystals (LCs) with graded index photonic crystal (GRIN PC). The GRIN PC structures are composed of low refractive index polymer annular rods having gradually varied radii of holes. To actively manipulate incident light, the annular rods are infiltrated with nematic LCs. By applying an external voltage to the infiltrated LCs, the effective index profile of the low-index GRIN PC structure is modulated without introducing any mechanical movement. The incident beam deflection and corresponding focal distance modulation are tuned only by controlling the applied bias voltage. In the present work, hyperbolic secant refractive index profile is chosen to design GRIN PC structures. To design GRIN PC structure with annular PCs, Maxwell-Garnett effective medium approximation is employed. Moreover, we analytically express the relation between infiltrated LCs and gradient parameter to show the physical background of the tuning ability of the proposed devices. Also, beam steering and afocal zooming devices are analytically investigated via geometrical optics and numerically realized with the help of the finite-difference time-domain method. A beam deflection with an angle change of Δθout= 44° and a light magnification with maximum x2.15 are obtained. LCs are inexpensive materials and work under low voltage/power condition. This feature can be used for designing an electro-optic GRIN PC device that can be useful in various optical applications.

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Crescent shaped dielectric periodic structure for light manipulation

Cited by 23 publications

References 46 publications

Chiral Surface Wave propagation with Anomalous Spin-momentum Locking

Chiral Surface Wave propagation with Anomalous Spin-momentum Locking

Reduced symmetry and analogy to chirality in periodic dielectric media

Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures

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