Efficient mode-order conversion using a photonic crystal structure with low symmetry

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

doi:10.1364/josab.30.003086

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…Mode-order conversion applications using low-symmetric PCs have already been studied [83]. For that purpose, a heterostructure is formed by regular (symmetric) PCs and C 1 symmetric PCs (MAPCs).…”

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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“…[26][27][28][29] A typical method to resolve multimodes is based on far-field coupling to form different incident wavevectors k, that is, k-resolved method. [29][30][31][32][33] Recently, the emergence of topological photonics gives a new degree of freedom, that is, pseudospin, to resolve the multimodes in near-field region. [34][35][36][37][38][39] For example, in valley photonic crystals, the binary states at K/K (different wavevectors) are locked to a pair of valley pseudospins with OAM-like phase vortex.…”

Section: Introductionmentioning

confidence: 99%

Selective Excitation of Band Extrema in Valley Photonic Crystals

Yuan

Zhao

et al. 2019

Annalen der Physik

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Flexible control of building blocks of photonic crystals enables achieving desirable band structures. Exploration of photonic band extrema has brought many fantastic features to design artificial optical materials, such as Brillouin-zone-corner extrema for valley photonic materials and zone-center extremum for zero-index metamaterials. However, two such kinds of extrema are always found independently in different photonic crystals. In this work, a kind of valley photonic crystals possessing both zone-center and zone-corner band extrema almost at the same frequency is proposed. Inspired by antennas theory, a three-antenna array (TAA) source is devoted to individually manipulate each extremum. The correlation coefficient is given to determine the coupling efficiency between the TAA source and extrema eigenmodes. By using a source with a high correlation coefficient, these extrema bulk states are selectively excited consistent with their eigenfields. Furthermore, three control cases are shown that multiple extrema points are simultaneously excited, in order to confirm the validity of the correlation coefficient. Finally, a potential application of a beam-steering device is proposed through selective excitation of ternary extrema. This work develops binary valley states into ternary mix states, rendering more degrees of freedom for on-chip optical information transport, particularly for beam steering and mode division multiplexing.

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“…There have been several methods in order to achieve mode order conversion [2,[7][8][9][10][11][12][13][14][15][16][17]. One of these methods is based on Bragg gratings which have high reflection/transmission efficiency but require long distances to achieve conversion [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Another method is mode order transformation by two-dimensional graded index photonic crystals [11,12]. Similarly, a recent approach utilized modified annular photonic crystals [18] that provide remarkably high bandwidth but relatively lower transmission efficiency due to input and output coupling losses [14]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Large bandwidth mode order converter by differential waveguides

Öner¹,

Üstün²,

Kurt³

et al. 2015

Opt. Express

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In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by inducing required phase difference between the equal length waveguides of different widths. Y-junctions are composed of both tapered mode splitter and combiner to connect mono-mode waveguide to multi-mode waveguide. The converted mode profiles at the output port show that the device operates successfully at designed wavelengths with wide bandwidth. This study provides a novel technique to implement compact mode order converters and direction selective/sensitive photonic structures.

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Efficient mode-order conversion using a photonic crystal structure with low symmetry

Cited by 12 publications

References 25 publications

Reduced symmetry and analogy to chirality in periodic dielectric media

Reduced symmetry and analogy to chirality in periodic dielectric media

Selective Excitation of Band Extrema in Valley Photonic Crystals

Large bandwidth mode order converter by differential waveguides

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