Efficient mode converter design using asymmetric graded index photonic structures

Öner, Bilgehan Barış; Turduev, Mırbek; Giden, İbrahim Halil; Kurt, Hamza

doi:10.1364/ol.38.000220

Cited by 31 publications

(25 citation statements)

References 16 publications

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“…In a recently published paper, we introduced the idea of the mode conversion process by utilizing one type of A-GRIN structure [43]. On the other hand, two different asymmetric refractive index profiles are explored in the current work.…”

Section: Discussion and Evaluation Of The Numerical Simulation Resultsmentioning

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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Section: Discussion and Evaluation Of The Numerical Simulation Resultsmentioning

confidence: 99%

Mode transformation using graded photonic crystals with axial asymmetry

et al. 2013

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“…due to altering the lattice spacing, the radii of rods (or holes) and the refractive index of a material. The GRIN PCs have numerous applications when forming mode-order converters [13,14], wavelength demultiplexers [15,16], couplers [17] and lenses [18].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of two different graded-index photonic-crystal lenses

Gharaati¹,

Miri²

2017

Ukr. J. Phys. Opt.

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Abstract:We investigate two alternative approaches for implementing graded-index (GRIN) photonic-crystal (PC) structures that reveal a focusing effect. Gradient of the refractive index is achieved either using a symmetry-reduction approach (a structure of type I) or varying a filling fraction of PC elements (a structure of type II). We test the first structure for the frequencies located inside the first and second bands of the dispersion diagram. The focusing effect of the first structure characteristic for the frequencies located above the bandgap is stronger than that for the frequencies below the bandgap. It is demonstrated that variations of filling fractions of the elliptical air holes in the structure of type II produce a GRIN lens that manifests a pronounced focusing effect. We have also compared the focusing effects of the latter structure for the TE and TM polarizations. The both structures suggested in the present work can work in a broad enough band region.

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“…Graded Photonic Crystals (GPC), which are derived from PCs by gradual modification of the elementary cell of PCs, improve the ability of PCs to control the EM field propagation [2,3], since they have demonstrated their ability to curve the flow of light [4]. Quasi-transparency [5], demultiplexing [6], focussing [7][8][9][10][11][12], coupling [13], mode conversion [14], or the mimicking of a natural structured material [15] are the phenomena which have also been demonstrated by the means of GPCs. Besides, gradient index (GRIN) optics, which finds many applications in imagery and in telecommunications and has been widely studied for a long time (see [16,17]), is undergoing a renewal [18].…”

Section: Introductionmentioning

confidence: 99%