A versatile optical junction using photonic band-gap guidance and self collimation

Gupta, Man Mohan; Medhekar, Sarang

doi:10.1063/1.4896622

Cited by 15 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained results show that collimation of the waves incident at different angles and independence of two processes in the studied structures with two-side corrugations are immune to wide-range variations of t (not shown). It is noteworthy that two independent incidencetransmission-reflection processes have earlier been considered in photonic-crystal-based structures [20,46]. Two independent off-axis beaming processes with collimation capability have earlier been studied in thin metallic gratings with a single long slit and different lamellar corrugations at the left and the right side of the exit interface [16].…”

Section: Fig 10mentioning

confidence: 99%

Connection of Collimation, Asymmetric Beaming, and Independent Transmission-Reflection Processes in Concentric-Groove Gratings Supporting Spoof Surface Plasmons

et al. 2018

View full text Add to dashboard Cite

Transmission through subwavelength apertures enables separation of the incidence half-space and the exit half-space, which leads to that the spatial distribution of the field in the latter is not affected by the distribution in the former. The distribution in the exit half-space is mainly determined by the properties of surface plasmons (SPs) at the exit-side interface. In this paper, for the microwave structures with one-side concentric corrugations around a single annular hole, we demonstrate the possible connections between asymmetric transmission in the beaming regime and collimation of the waves incident at different angles, which can be considered as two sides of the same phenomenon occurring due to the common effect of such a separation and the radiation shaping effect being possible due to the spoof SPs at the corrugated exit interface. Collimation manifests itself in that the waves incident at different angles from a wide range contribute to the single outgoing beam so that a far-zone observer cannot distinguish between the contributions of different angles of arrival. Asymmetry in transmission manifests itself in that the spatial shaping of radiation (beaming) in the exit half-space appears only for one of the two opposite incidence directions. Moreover, even in the structures with the same corrugations on both sides, i.e., without asymmetric transmission, spatial separation of two wave processes, e.g., two symmetric or asymmetric collimation processes, can be obtained for a wide range of nonzero angles of incidence.

show abstract

Section: Fig 10mentioning

confidence: 99%

Connection of Collimation, Asymmetric Beaming, and Independent Transmission-Reflection Processes in Concentric-Groove Gratings Supporting Spoof Surface Plasmons

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Point defect occurs by completely removing or changing structural parameters of the rod. Designing PhC structures requires the introduction of one or both types of defects [30][31][32][33][34]. These structures are applied in various optical devices such as design and fabrication of optical waveguides, optical lenses, optical lters, optical MUXs/DEMUXs, optical splitters, photonic sensors, optical converters, all-optical logic gates, optical modulators/demodulators and other types of optical devices.…”

Section: Introductionmentioning

confidence: 99%

Improved Low Crosstalk, High Transmission and Quality Factor Eight Channel Demultiplexer Based on Photonic Crystal

Azadi

Mohammadi

Olyaee

et al. 2022

Preprint

View full text Add to dashboard Cite

Due to the importance of all-optical demultiplexers (DEMUXs) in optical communication networks, this study aims to design and simulate a novel type of DEMUX using 2D photonic crystals (2D-PhCs). The proposed structure consists of one input waveguide and eight output channels considering linear and point defects. To design this DEMUX, silicon dielectric rods with the refractive index of 3.45 are employed in the air background, the radius of which is equal to R=0.21Ʌ (Ʌ = 0.522µm) where Ʌ is the lattice constant. The photonic band gap (PBG) and output spectrum of the structure are analyzed by the plane wave expansion (PWE) and finite-difference time-domain (FDTD) methods, respectively. The simulation results indicate the average quality factor and transmission efficiency are 3,602 and 98%, respectively, and inter-channel crosstalk ranges from -60.5 to -25.5 dB.

show abstract

“…However, self-collimation can also occur along directions of high symmetry of the PhC where angularly wider flat regions can be achieved [2] and smaller beams can propagate under self-collimation. All of the proposed [3][4][5][6][7][8][9][10][11] or demonstrated [2,[12][13][14][15][16][17][18] devices rely on self-collimation along a direction of high symmetry of the supporting PhC. Moreover, broad-band and broad-angle operation have been achieved in bi-dimensional PhCs [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic self-collimation along arbitrary directions and below the light line

Magno¹,

Gauthier-Lafaye²,

Calò³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

Self-collimation (SC) and mesoscopic self-collimation (MSC) have been successfully demonstrated along the directions of high symmetry of photonic crystals. Indeed, wide angular acceptances are obtained only in these directions which offer extremely flat isofrequencies. In this article, we numerically demonstrate that mesoscopic self-collimation with large angular acceptance can be achieved along arbitrary directions that are not of high symmetry. In particular, we propose a simple method that allows to easily find all the non-trivial collimation directions and corresponding frequencies. Thanks to the double periodicity of the mesoscopic crystal, these solutions can be effectively tailored in terms of direction and frequency. Moreover, non-trivial MSC solutions can be found well below the light cone. These MSC features open up the possibility of designing complex systems by combining different configurations, such as high reflection (HR) or anti reflection (AR) ones, or active materials.

show abstract

A versatile optical junction using photonic band-gap guidance and self collimation

Cited by 15 publications

References 21 publications

Connection of Collimation, Asymmetric Beaming, and Independent Transmission-Reflection Processes in Concentric-Groove Gratings Supporting Spoof Surface Plasmons

Connection of Collimation, Asymmetric Beaming, and Independent Transmission-Reflection Processes in Concentric-Groove Gratings Supporting Spoof Surface Plasmons

Improved Low Crosstalk, High Transmission and Quality Factor Eight Channel Demultiplexer Based on Photonic Crystal

Mesoscopic self-collimation along arbitrary directions and below the light line

Contact Info

Product

Resources

About