Polymer multimode waveguide bend based on a multilayered Eaton lens

Badri, S. Hadi; Saghai, H. Rasooli; Soofi, Hadi

doi:10.1364/ao.58.005219

Cited by 24 publications

(4 citation statements)

References 39 publications

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“…Multimode waveguide bend is another building block of the MDM system to realize a compact footprint and flexible layout. Numerous investigations have also been made, with typical schemes of Euler bend, mode converter, , transformation optics structure, , and subwavelength gratings . For the mode converter-based multimode bend, it is difficult to be extended to support more mode channels.…”

Section: Realization Of Multimode Devicesmentioning

confidence: 99%

Key Multimode Silicon Photonic Devices Inspired by Geometrical Optics

Sun

Ding

et al. 2020

ACS Photonics

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On-chip optical interconnect has been widely accepted as a promising technology to realize future large-scale multiprocessors. Mode-division multiplexing (MDM) provides a new degree of freedom for optical interconnects to dramatically increase the link capacity. For present on-chip multimode devices, although large amounts of computation and optimization are adopted to support more modes, mode-independent manipulation is still hard to be achieved due to severe mode dispersion. Here, we propose a promising solution to standardize the design of fundamental multimode building blocks, inspired by the geometrical-optics concept, adopting a waveguide width larger than the working wavelength. The proposed solution can tackle a group of modes at the same time with very simple processes, avoiding a demultiplexing procedure and ensuring compact footprint. Compared to the conventional schemes, it is scalable to larger mode channels without increasing the complexity and whole footprint. As a proof of concept, we demonstrate a set of multimode building blocks, including crossing, bend, coupler, and switches, with low loss and power consumption. Our work promotes the multimode photonics research and makes the MDM technique more practical.

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Section: Realization Of Multimode Devicesmentioning

confidence: 99%

Key Multimode Silicon Photonic Devices Inspired by Geometrical Optics

Sun

Ding

et al. 2020

ACS Photonics

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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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“…For example, focusing lens has been adopted in fundamentalmode spot size converters (SSCs) [7][8][9][10]. Eaton lens has been demonstrated to bend the light trajectory on chip (waveguide bend) [11,12], and Maxwell fish eye lens's aberration-free imaging property has been utilized to build multimode waveguide (MWG) crossings [13,14]. Furthermore, fascinating functionalities of collimating on-chip Gaussian beams [15,16], emulating curved spacetimes [17,18], focusing with ultralow longitudinal spherical aberration [19] and optical diffractive computing [9] have also been implemented.…”

Section: Introductionmentioning

confidence: 99%

On-chip arbitrary-mode spot size conversion

Wei

Zhang

2020

Nanophotonics

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Manipulating on-chip optical modes via components in analogy with free-space devices provides intuitional light control, and this concept has been adopted to implement single-lens–assisted spot size conversion using integrated device. However, the reported schemes have been demonstrated only for fundamental mode, while high-order or irregular modes are preferred in specific applications. The 4-f system is widely used in Fourier optics for optical information processing. Under the inspiration of the 4-f system and the beam expander in bulk optics, a spot size converter (SSC) with two metamaterial-based graded-index waveguides is proposed and demonstrated. The proposed device is capable of widening an arbitrary mode while preserving its profile shape. Compared with conventional SSC using adiabatic taper, the footprint can be reduced by 91.5% under a same intermode crosstalk. Experimentally, an expansion ratio of five is demonstrated for regular modes. Furthermore, for an irregular mode, the functionality is numerically verified without structure modification. This work offers a universal solution to on-chip spot size conversion and may broaden the on-chip application prospects of Fourier optics.

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Polymer multimode waveguide bend based on a multilayered Eaton lens

Cited by 24 publications

References 39 publications

Key Multimode Silicon Photonic Devices Inspired by Geometrical Optics

Key Multimode Silicon Photonic Devices Inspired by Geometrical Optics

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

On-chip arbitrary-mode spot size conversion

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