Integrated 2D-Graded Index Plasmonic Lens on a Silicon Waveguide for Operation in the Near Infrared Domain

Fan, Yulong; Roux, Xavier Le; Коровин, А. В.; Lupu, Anatole; Lustrac, André de

doi:10.1021/acsnano.7b00150

Cited by 32 publications

(22 citation statements)

References 47 publications

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“…Optimization toward functions with multi-input/output for parallel signal processing can be of a significant computational cost, as the inverse design is numerically driven. Gradient varying on-chip metasurface based on plasmonics 23,24 or dielectric metamaterials 16–18,25–28 have been demonstrated for the on-chip lens. Compared with the two-dimensional metasurface-based image processors 12 , the on-chip meta-system can operate without an alignment step, but limited to process one-dimensional (1D) data represented through the wavefront in x – y plane 16,23,31,32 .…”

Section: Introductionmentioning

confidence: 99%

On-chip wavefront shaping with dielectric metasurface

et al. 2019

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Metasurfaces can be programmed for a spatial transformation of the wavefront, thus allowing parallel optical signal processing on-chip within an ultracompact dimension. On-chip metasurfaces have been implemented with two-dimensional periodic structures, however, their inherent scattering loss limits their large-scale implementation. The scattering can be minimized in single layer high-contrast transmitarray (HCTA) metasurface. Here we demonstrate a one-dimensional HCTA based lens defined on a standard silicon-on-insulator substrate, with its high transmission (<1 dB loss) maintained over a 200 nm bandwidth. Three layers of the HCTAs are cascaded for demonstrating meta-system functionalities of Fourier transformation and differentiation. The meta-system design holds potential for realizing on-chip transformation optics, mathematical operations and spectrometers, with applications in areas of imaging, sensing and quantum information processing.

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Section: Introductionmentioning

confidence: 99%

On-chip wavefront shaping with dielectric metasurface

et al. 2019

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“…The resonant frequency of the localized surface plasmons is the primary parameter for the engineering of such hybrid waveguides local effective index. The effective permittivity  eff of the hybrid metal/dielectric slab waveguide can be approximated as the sum of the effective permittivity of the dielectric slab waveguide and Lorentzian type dispersion formula accounting for the resonant features of plasmonic cut wires [22,23]. As shown in Fig.…”

Section: Metalines Based Wavelength Dmux Operation Principle Design mentioning

confidence: 99%

“…For a given CWs dimensions the effective index of the hybrid metal-dielectric waveguides, displayed in Fig. 1(b), was determined by means of numerical modeling with subsequent retrieval procedure [23,27]. Here for 140 and 190 nm CWs length the resonance frequencies are 295 THz and 225 THz, respectively.…”

Section: Metalines Based Wavelength Dmux Operation Principle Design mentioning

confidence: 99%

“…Meanwhile another possibility for the manipulation of the optical flow by means of metasurfaces is to use them in a guided wave configuration [16][17][18][19][20][21][22]. The demonstration of a gradient effective index metalens based on this concept was recently reported [23]. The technological implementation is performed by means of a metasurface made of 2D array of gold cut wires (CWs) integrated on the top of the Si waveguide.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-compact on-chip metaline-based 13/16 μm wavelength demultiplexer

Fan¹,

Roux²,

Lupu³

et al. 2019

Photon. Res.

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In this article, we report an experimental demonstration of enabling technology exploiting resonant properties of plasmonic nanoparticles, for the realization of wavelength sensitive ultra-minituarized (4×4 µm) optical metadevices. To this end the example of a 1.3/1.6 µm wavelength demultiplexer is considered. Its technological implementation is based on the integration of gold cut wire based metalines on the top of a silicon on insulator waveguide. The plasmonic metalines modify locally the effective index of the Si waveguide and thus allow for the implementation of wavelength dependent optical pathways. The 1.3/1.6µm wavelength separation with extinction ratio between two demultiplexer's channels reaching up to 20dB is experimentally demonstrated. The considered approach, which can be readily adapted to other planar lightwave circuits platforms and nanoresonators of different types of materials, is suited for the implementation of a generic family of wavelength sensitive guided wave optical metadevices.http://dx.

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“…The special output light beams can be freely harnessed by the phase discontinuity serving as a degree of freedom that can be engineered by the artificial periodic structures of optical metasurface. In the last decade, the continuous development of nanofabrication technologies was the main driving impetus that has advanced and enriched the bourgeoning research field of optical metasurfaces, triggering plethora of applications such as optical metalens [2][3][4][5][6][7][8][9], beam splitter [10][11][12], integrator [13][14][15], differentiator [13,[15][16][17], Stokes parameters extractors [18][19][20], hologram [10,[21][22][23][24][25][26][27][28], special light beam generators [10,[29][30][31][32][33][34][35][36][37][38], and etc. Among all the diverse metasurfaces, the optical PB phase metasurfaces have attracted more and more interests of scientists owing to their high degrees of freedom by easily rotating the orientation of the unit cells, and their high conversion efficiency due to the low dielectric loss [2,…”

Section: Introductionmentioning

confidence: 99%

Phase-controlled metasurface design via optimized genetic algorithm

Fan

Qiu

et al. 2020

Nanophotonics

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AbstractIn an optical Pancharatnam-Berry (PB) phase metasurface, each sub-wavelength dielectric structure of varied spatial orientation can be treated as a point source with the same amplitude yet varied relative phase. In this work, we introduce an optimized genetic algorithm (GA) method for the synthesis of one-dimensional (1D) PB phase-controlled dielectric metasurfaces by seeking for optimized phase profile solutions, which differs from previously reported amplitude-controlled GA method only applicable to generate transverse optical modes with plasmonic metasurfaces. The GA–optimized phase profiles can be readily used to construct dielectric metasurfaces with improved functionalities. The loop of phase-controlled GA consists of initialization, random mutation, screened evolution, and duplication. Here random mutation is realized by changing the phase of each unit cell, and this process should be efficient to obtain enough mutations to drive the whole GA process under supervision of appropriate mutation boundary. A well-chosen fitness function ensures the right direction of screened evolution, and the duplication process guarantees an equilibrated number of generated light patterns. Importantly, we optimize the GA loop by introducing a multi-step hierarchical mutation process to break local optimum limits. We demonstrate the validity of our optimized GA method by generating longitudinal optical modes (i. e., non-diffractive light sheets) with 1D PB phase dielectric metasurfaces having non-analytical counter-intuitive phase profiles. The produced large-area, long-distance light sheets could be used for realizing high-speed, low-noise light-sheet microscopy. Additionally, a simplified 3D light pattern generated by a 2D PB phase metasurface further reveals the potential of our optimized GA method for manipulating truly 3D light fields.

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Integrated 2D-Graded Index Plasmonic Lens on a Silicon Waveguide for Operation in the Near Infrared Domain

Cited by 32 publications

References 47 publications

On-chip wavefront shaping with dielectric metasurface

On-chip wavefront shaping with dielectric metasurface

Ultra-compact on-chip metaline-based 13/16 μm wavelength demultiplexer

Phase-controlled metasurface design via optimized genetic algorithm

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