Improved broad bandwidth intersections in photonic crystals

Zhou, Jianhong; Xü, Dong; Mu, Da; Yang, Jian; Han, Wenbo

doi:10.1016/j.optcom.2011.08.081

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Various methods for designing a broadband waveguide crossing with low insertion loss and low crosstalk levels have been proposed. Most notable photonic crystal waveguide crossings include designs based on resonant cavity [1][2][3], coupled-cavity waveguide [4], utilizing the symmetric properties of the propagation modes of square-lattice [5], nonidentical coupled resonator waveguides [6], cascading cavities [7,8], topology optimization [9], Wannier basis design and optimization [10], and self-collimation phenomenon [11]. The intersections based on resonant cavities have inherently narrow bandwidth with crosstalk levels below −30 dB.…”

Section: Introductionmentioning

confidence: 99%

“…To increase the bandwidth, the Q-factor is decreased, resulting in weaker mode-matching between the waveguides and resonant cavities and consequently lower transmission. There has been no report of multimode waveguide crossing based on the above methods [1][2][3][4][5][6][7][8][9][10][11] and they only support a single propagating mode. Silicon-on-insulator (SOI) waveguide crossings can be designed based on multimode interference (MMI) [12][13][14][15][16][17][18], mode expanders [19,20], subwavelength grating [21,22], and wavefront matching [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Polygonal Maxwell’s fisheye lens via transformation optics as multimode waveguide crossing

Badri

Saghai

Soofi

2019

J. Opt.

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Multimode waveguide crossings are crucial components for novel mode-division-multiplexing systems. One of the challenges of multimode waveguide routing in MDM systems is decreasing the inter-mode crosstalk and mode leakage of waveguide crossings. In this work, we present the intersections of three and four waveguides based on polygonal Maxwell's fisheye lens via transformation optics. The designed lenses are implemented by mapping their refractive index to the thickness of guiding Si layer. The three-dimensional finite-difference time-domain simulations are used to evaluate the performance of the proposed 3×3 and 4×4 crossings. The footprint of the 3×3 and 4×4 waveguide star crossings are 18.6×18.6 and 27.5×27.5 µm 2 , respectively. For both waveguide crossings, the intermodal crosstalk in the output port is lower than -22dB while the crosstalk to other ports is lower than -37dB for TE0, TE1, and TE2 modes. The insertion losses for these modes are lower than 0.5dB in a bandwidth of 415nm covering the whole optical telecommunication bands.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polygonal Maxwell’s fisheye lens via transformation optics as multimode waveguide crossing

Badri

Saghai

Soofi

2019

J. Opt.

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“…Photonic crystal (PC) is a kind of material with periodical dielectric synthetic structures 1,2 . By the virtue of its perfect band gap structure and potential application, PC has received more and more researchers' attention [3][4][5][6][7][8][9][10][11][12] . The theory and technology of PC has rapidly developed.…”

Section: Introductionmentioning

confidence: 99%

The Localized Mode and its Photoluminescence Characteristics of the Nematic-Liquid-Crystal-Filled One Dimensional Photonic Crystal

Xie

Zeng

2012

AMR

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The localized mode and its Photoluminescence Characteristics of one dimensional liquid-crystal-filled photonic crystal with a defect layer (1DNLCFPC) were studied numerically by the transfer matrix method. Nematic liquid crystal (NLC) could be treated as uniaxial media when the external electric field intensity over the threshold. The angle θ was the angle between the direction of the vertical incident light and the direction of the electric field. When θ increased, the results could be found as follow: the 1DNLCFPC’s band gap gets wide and the wavelengths of both band edges get small; the defect mode’s wavelength of 1DNLCFPC gets small. The half-width at the defect modes’ half maximum is less than 0.2nm. The localized phenomenon can be found in the defect modes, meanwhile, light energy is localized nearby the defect layer. The largest relative light intensity in the localized layers has large value when the pump rate is very small.

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Liquid refractive index sensor based on slow light in slotted photonic crystal waveguide

Zhang

Zhao

Wang

et al. 2013

Optik

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Improved broad bandwidth intersections in photonic crystals

Cited by 5 publications

References 13 publications

Polygonal Maxwell’s fisheye lens via transformation optics as multimode waveguide crossing

Polygonal Maxwell’s fisheye lens via transformation optics as multimode waveguide crossing

The Localized Mode and its Photoluminescence Characteristics of the Nematic-Liquid-Crystal-Filled One Dimensional Photonic Crystal

Liquid refractive index sensor based on slow light in slotted photonic crystal waveguide

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