Plasmonic Micro Lens for Extraordinary Transmission of Broadband Light

Saxena, Sumit; Chaudhary, Raghvendra Pratap; Singh, Abhay Kumar; Awasthi, Saurabh; Shukla, Shobha

doi:10.1038/srep05586

Cited by 15 publications

(7 citation statements)

References 34 publications

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“…The specific implementation relies on creating a circular aperture in which the diameter can be altered in a colour selective manner. For a circular aperture, the intensity variation along the axis is determined by the incident wavelength, aperture size, and distance from the aperture, and can be described analytically by Rayleigh-Sommerfeld diffraction 41 , 42 . We patterned a silicon substrate with cylindrical concentric rings n = 1, 2, and 3 perovskites, as shown schematically in Fig.…”

Section: Resultsmentioning

confidence: 99%

Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites

et al. 2017

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Controlling and modulating terahertz signals is of fundamental importance to allow systems level applications. We demonstrate an innovative approach for controlling the propagation properties of terahertz (THz) radiation, through use of both the excitation optical wavelength (colour) and intensity. We accomplish this using two-dimensional (2D) layered hybrid trihalide perovskites that are deposited onto silicon substrates. The absorption properties of these materials in the visible range can be tuned by changing the number of inorganic atomic layers in between the organic cation layers. Optical absorption in 2D perovskites occurs over a broad spectral range above the bandgap, resulting in free carrier generation, as well as over a narrow spectral range near the bandedge due to exciton formation. We find that only the latter contribution gives rise to photo-induced THz absorption. By patterning multiple 2D perovskites with different optical absorption properties onto a single device, we demonstrate both colour selective modulation and focusing of THz radiation. These findings open new directions for creating active THz devices.

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Section: Resultsmentioning

confidence: 99%

Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites

et al. 2017

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“…Using the Rayleigh-Sommerfeld (R-S) formula [13,28,29], the focal length of the finite-size NHA microlens can be calculated:…”

Section: Broadband Operation Of Optic Microlensmentioning

confidence: 99%

Plasmonic Nanopores: Optofluidic Separation of Nano-Bioparticles via Negative Depletion

Zhu¹,

Çiçek²,

Li³

et al. 2021

Nanopores

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In this chapter, we review a novel “optofluidic” nanopore device enabling label-free sorting of nano-bioparticles [e.g., exosomes, viruses] based-on size or chemical composition. By employing a broadband objective-free light focusing mechanism through extraordinary light transmission effect, our plasmonic nanopore device eliminates sophisticated instrumentation requirements for precise alignment of optical scattering and fluidic drag forces, a fundamental shortcoming of the conventional optical chromatography techniques. Using concurrent optical gradient and radial fluidic drag forces, it achieves self-collimation of nano-bioparticles with inherently minimized spatial dispersion against the fluidic flow. This scheme enables size-based fractionation through negative depletion and refractive-index based separation of nano-bioparticles from similar size particles that have different chemical composition. Most remarkably, its small (4 μm × 4 μm) footprint facilitates on-chip, multiplexed, high-throughput nano-bioparticle sorting using low-cost incoherent light sources.

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“…Metamaterials are a class of artificially engineered materials which offer the possibility of achieving effective properties beyond the scope of naturally existing properties of constituent elements. These are envisioned to have several important applications such as surface wave manipulation, sub-wavelength focusing [ 1 – 5 ], extraordinary transmission [ 6 – 9 ] and cloaking [ 10 , 11 ]. While early developments can be traced back to 1967 in the theoretical report by Veselago [ 12 ], the first experimental realization of such materials was reported only in 2001 [ 13 ] by simultaneously achieving negative permittivity and negative permeability using a split ring resonator.…”

Section: Introductionmentioning

confidence: 99%

“…focusing [1][2][3][4][5], extraordinary transmission [6][7][8][9] and cloaking [10,11]. While early developments can be traced back to 1967 in the theoretical report by Veselago [12], the first experimental realization of such materials was reported only in 2001 [13] by simultaneously achieving negative permittivity and negative permeability using a split ring resonator.…”

Section: Introductionmentioning

confidence: 99%

Predicting double negativity using transmitted phase in space coiling metamaterials

et al. 2018

Self Cite

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Metamaterials are engineered materials that offer the flexibility to manipulate the incident waves leading to exotic applications such as cloaking, extraordinary transmission, sub-wavelength imaging and negative refraction. These concepts have largely been explored in the context of electromagnetic waves. Acoustic metamaterials, similar to their optical counterparts, demonstrate anomalous effective elastic properties. Recent developments have shown that coiling up the propagation path of acoustic wave results in effective elastic response of the metamaterial beyond the natural response of its constituent materials. The effective response of metamaterials is generally evaluated using the ‘S’ parameter retrieval method based on amplitude of the waves. The phase of acoustic waves contains information of wave pressure and particle velocity. Here, we show using finite-element methods that phase reversal of transmitted waves may be used to predict extreme acoustic properties in space coiling metamaterials. This change is the difference in the phase of the transmitted wave with respect to the incident wave. This method is simpler when compared with the more rigorous ‘S’ parameter retrieval method. The inferences drawn using this method have been verified experimentally for labyrinthine metamaterials by showing negative refraction for the predicted band of frequencies.

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Plasmonic Micro Lens for Extraordinary Transmission of Broadband Light

Cited by 15 publications

References 34 publications

Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites

Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites

Plasmonic Nanopores: Optofluidic Separation of Nano-Bioparticles via Negative Depletion

Predicting double negativity using transmitted phase in space coiling metamaterials

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