Low-index-contrast waveguide bend based on truncated Eaton lens implemented by graded photonic crystals

Badri, S. Hadi; Gilarlue, M. M.

doi:10.1364/josab.36.001288

Cited by 24 publications

(8 citation statements)

References 30 publications

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“…We have implemented the designed hexagonal and octagonal MFE lenses on SOI platform with varying the thickness of Si slab waveguide. GRIN lenses can also be implemented by graded photonic crystal (GPC) or multilayer structures [42,43]. The refractive index profile of the MFE lens can be implemented by varying the height of a silicon slab…”

Section: Implementation Of the Square Mfe Lensmentioning

confidence: 99%

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: Implementation Of the Square Mfe Lensmentioning

confidence: 99%

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

Badri

Saghai

Soofi

2019

J. Opt.

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“…9,10 As primary functions, these manipulations are basic elements for the creation of further devices and systems. For example, the graded-index waveguide-based on-chip focusing lenses have been used as mode spot size converters and 4f systems, [11][12][13][14] Eaton lenses have been utilized as on-chip waveguide bends, 15,16 and Maxwell's fish-eye lenses have been demonstrated as multimode waveguide crossings. 17,18 However, owing to the sensitive wavelength dependence of the waveguide mode, these lenses are usually only suitable for specific operating wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Achromatic on-chip focusing of graphene plasmons for spatial inversions of broadband digital optical signals

2023

Adv. Photon. Nexus

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.On-chip focusing of plasmons in graded-index lenses is important for imaging, lithography, signal processing, and optical interconnects at the deep subwavelength nanoscale. However, owing to the inherent strong wavelength dispersion of plasmonic materials, the on-chip focusing of plasmons suffers from severe chromatic aberrations. With the well-established planar dielectric grating, a graded-index waveguide array lens (GIWAL) is proposed to support the excitation and propagation of acoustic graphene plasmon polaritons (AGPPs) and to achieve the achromatic on-chip focusing of the AGPPs with a focus as small as about 2% of the operating wavelength in the frequency band from 10 to 20 THz, benefiting from the wavelength-independent index profile of the GIWAL. An analytical theory is provided to understand the on-chip focusing of the AGPPs and other beam evolution behaviors, such as self-focusing, self-collimation, and pendulum effects of Gaussian beams as well as spatial inversions of digital optical signals. Furthermore, the possibility of the GIWAL to invert spatially broadband digital optical signals is demonstrated, indicating the potential value of the GIWAL in broadband digital communication and signal processing.

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“…Later, more and more studies pointed out that the PC can gradually adjust the radius of the air holes [15,16], lattice constant [14,17,18] and material parameters [19] to achieve the gradual change of the internal effective refractive index. And GPC have been studied extensively for focusing [15][16][17][20][21][22], selfcollimation [19], superbending [23] and waveguide [24,25]. Cen et al proposed a GPC flat lens which can realize the imaging of the point source and sub-wavelength focusing of the plane wave in the first, second and fifth bands [26].…”

Section: Introductionmentioning

confidence: 99%

Super-resolution imaging of negative-refractive graded-index photonic crystal flat lens

Liang

Huang

Jiao

2022

Mater. Res. Express

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Photonic crystal (PC) not only breaks through the diffraction limit of traditional lenses but also can realize super-resolution imaging. Improving the resolution is the key task of PC imaging. The main work of this paper is to use a graded-index Photonic crystal (GPC) flat lens to improve the image resolution. An air-hole type two-dimensional (2D) GPC structure based on silicon medium is proposed in this paper. Numerical simulations through RSoft reveal that when the medium in the imaging area is air, the full width at half maximum (FWHM) value of a single image reaches 0.362λ. According to the Rayleigh criterion, the images of two point sources 0.57λ apart can also be distinguished. In the imaging system composed of cedar oil and GPC flat lens, the FWHM value of a single image reaches 0.34λ. In addition, the images of multiple point sources 0.49λ apart can still be distinguished.

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Low-index-contrast waveguide bend based on truncated Eaton lens implemented by graded photonic crystals

Cited by 24 publications

References 30 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

Achromatic on-chip focusing of graphene plasmons for spatial inversions of broadband digital optical signals

Super-resolution imaging of negative-refractive graded-index photonic crystal flat lens

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