Modified annular photonic crystals with enhanced dispersion relations: polarization insensitive self-collimation and nanophotonic wire waveguide designs

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

doi:10.1364/josab.29.001589

Cited by 29 publications

(13 citation statements)

References 55 publications

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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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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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“…These three characteristics can greatly enhance the efficiency of the SC and extend its applications [14]. Notice that most of the works reported so far support only one special polarization for the all-angle and broad-band SC, or the all-angle polarization insensitivity is limited to some frequency ranges only [2,11,14,15,22,23,[37][38][39][40][41][42][43][44]. To the best of our knowledge, there have been no reports on the all-angle, polarization-insensitive and, at the same time, relatively broad-band SC.…”

Section: Introductionmentioning

confidence: 99%

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

Noori¹,

Soroosh²,

Baghban³

2015

Ukr. J. Phys. Opt.

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Abstract. We have investigated the possibility for achieving (in the same structure), an all-angle, polarization-insensitive and broad-band self-collimation (SC), one of the most urgent requirements in the field of optical integration. To obtain these attractive SC features in 2D square-array photonic crystals, we have used several strategies and performed testing calculations, using plane-wave expansion and finite-difference time-domain methods. We have not complicated the basic structure for the SC and ensured its simple geometry. The all-angle SC can arise when the optical material of a hole-type structure is high-index. Our results have testified that the SC in the hole-type structure is less dependent on the light polarization, if compared with a similar rod-type one. Our optimized SC structure has a bandwidth of Δf/f c = 2.61% and supports the all-angle SC for both TE and TM polarizations at the expense of small (~ 3) deviation of light from the unique collimation direction. Notice that the latter can be tolerated in many integrated optical devices.

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“…The uniqueness of these structures is that they exhibit photonic band gaps (PBGs), i.e., frequency bands in which propagation of light is suppressed [1]. PC structures with fairly large PBGs are of paramount importance in designing polarization-independent photonic designs [2][3][4]. Besides, large PBGs are also required in a variety of optical applications, such as waveguides [5,6] and defect-mode microcavities [7].…”

Section: Introductionmentioning

confidence: 99%

Mode transformation using graded photonic crystals with axial asymmetry

et al. 2013

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We propose a mode conversion method that enables transformation of the propagating mode from fundamental to higher-order modes by utilizing asymmetric graded index (A-GRIN) structures. Refractive index variations of two different asymmetric gradient profiles, i.e., exponential and Luneburg lens profiles, have been approximated by two-dimensional photonic crystals (PCs). The basic structure is composed of constant radii with different lattice sizes. The designed GRIN mode converters provide relatively high transmission efficiency in the spectral region of interest and achieve the transformation in compact configuration. Numerical approaches utilizing the finitedifference time-domain and plane wave expansion methods are used to analyze the mode conversion phenomenon of proposed GRIN PC media. Analytical formulation based on ray theory is outlined to explore both ray trajectories and the physical concept of a wavefront retardation mechanism.

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Modified annular photonic crystals with enhanced dispersion relations: polarization insensitive self-collimation and nanophotonic wire waveguide designs

Cited by 29 publications

References 55 publications

Reduced symmetry and analogy to chirality in periodic dielectric media

Reduced symmetry and analogy to chirality in periodic dielectric media

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

Mode transformation using graded photonic crystals with axial asymmetry

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