Ultrahigh refractive index sensitivity and tunable polarization switching via infrared plasmonic lattice modes

Gutha, Rithvik R.; Sadeghi, Seyed M.; Wing, Waylin J.

doi:10.1063/1.4980060

Cited by 28 publications

(18 citation statements)

References 36 publications

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“…They demonstrated that narrow SLRs could be shifted from the visible (∼650 nm) through to the infrared (∼900 nm) range by altering the environment's refractive index. Gutha et al 235 confirmed that 2D arrays of large gold metallic nanodisks may have a greater sensitivity to changes in the superstrate's refractive index in the near IR region. The authors tuned the SLRs modes, using ultrathin layers of silicon, in the range from 1 to 1.7 μm and achieved a reasonably high refractive index sensitivity of ∼795 nm/RIU.…”

Section: Biosensing and Biorecognitionmentioning

confidence: 99%

Plasmonic Surface Lattice Resonances: A Review of Properties and Applications

et al. 2018

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When metal nanoparticles are arranged in an ordered array, they may scatter light to produce diffracted waves. If one of the diffracted waves then propagates in the plane of the array, it may couple the localized plasmon resonances associated with individual nanoparticles together, leading to an exciting phenomenon, the drastic narrowing of plasmon resonances, down to 1–2 nm in spectral width. This presents a dramatic improvement compared to a typical single particle resonance line width of >80 nm. The very high quality factors of these diffractively coupled plasmon resonances, often referred to as plasmonic surface lattice resonances, and related effects have made this topic a very active and exciting field for fundamental research, and increasingly, these resonances have been investigated for their potential in the development of practical devices for communications, optoelectronics, photovoltaics, data storage, biosensing, and other applications. In the present review article, we describe the basic physical principles and properties of plasmonic surface lattice resonances: the width and quality of the resonances, singularities of the light phase, electric field enhancement, etc. We pay special attention to the conditions of their excitation in different experimental architectures by considering the following: in-plane and out-of-plane polarizations of the incident light, symmetric and asymmetric optical (refractive index) environments, the presence of substrate conductivity, and the presence of an active or magnetic medium. Finally, we review recent progress in applications of plasmonic surface lattice resonances in various fields.

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Section: Biosensing and Biorecognitionmentioning

confidence: 99%

Plasmonic Surface Lattice Resonances: A Review of Properties and Applications

et al. 2018

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“…Metal nanoparticles (NPs) have been extensively adopted for light management in the visible spectrum. − On metal NPs, localized surface plasmon resonance (LSPR) can be excited by incident lights and a strong evanescent electromagnetic (EM) field can be generated around the metal NPs within a short range of a few tens to a few hundreds of nanometers. , The LSPR frequency is determined by free electron concentration in the metal, with minor tunability by the size and shape of the metal NPs as well as the external surrounding media . An important result of the LSPR is the enhancement of EM field surrounding metal NPs from several times to tens of times. − Therefore, this enhanced EM field can provide dramatically enhanced absorption to the photosensitizer layer, leading to an increased concentration of electron–hole pairs and thereby improved photoresponsivity. Typically, Ag and Au are two promising plasmonic materials for the application in the perovskite photodetector, as the LSPR frequency of Ag and Au could be tuned over the visible spectrum that matches the absorption spectrum of perovskite thin films.…”

Section: Introductionmentioning

confidence: 99%

Using Silver Nanoparticles-Embedded Silica Metafilms as Substrates to Enhance the Performance of Perovskite Photodetectors

Liu

Gutha

Kattel

et al. 2019

ACS Appl. Mater. Interfaces

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Plasmonic metal nanostructures provide a promising strategy for light trapping and therefore can dramatically enhance photocurrent in optoelectronics only if the trapped light can be coupled effectively from plasmons to excitons, whereas the reverse transfer of energy, charge, and heat from excitons to plasmons can be suppressed. Motivated by this, this work develops a scheme to implement a metafilm with Ag nanoparticles (NPs) embedded in 10 nm thick silica (Ag NPs–silica metafilm) to the active device channel of a hybrid perovskite film/graphene photodetector. Remarkably, an enhancement factor of 7.45 in photoresponsivity, the highest so far among all the reports adopting plasmonic metal NPs in perovskite photodetectors, has been achieved on the photodetectors with the Ag NPs–silica metafilms. Considering that the synthesis of the Ag NPs–silica metafilms can be readily scaled up to coat both rigid and flexible substrates, this result provides a low-cost metaplatform for a variety of high-performance optoelectronic device applications.

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“…A very recent study revealed that arrays of large gold nanodisks with a rectangle lattice structure can tune polarizationdependent plasmonic lattice modes, which is in principle based on the diffraction of light. 48 However, additional simulations of the array of dielectric dimers, which are not shown in this manuscript due to the lack of space, confirmed that the polarization switching in this study comes from the mode hybridizations of the excited electric and magnetic dipoles, rather than from the light diffraction.…”

mentioning

confidence: 49%

Polarization control of high transmission/reflection switching by all-dielectric metasurfaces

Shibanuma

Maier

Albella

2018

Applied Physics Letters

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Metasurfaces built of high refractive dielectric nanostructures could play a key role in controlling the electromagnetic wave propagation, due to their low energy losses and their ability to excite not only electric but also magnetic resonances. In this study, we theoretically and experimentally demonstrate that an array of high-index dielectric nanodimers can perform as tuneable metasurfaces that can be switched from a high transmitter to a high reflector, by just changing the linear polarization of excitation. The incident polarization alters the hybridization mode of the excited electric and magnetic dipoles in the dimer, and this leads to either spectral overlap or separation of the two dipoles. The hybridization of the electric and magnetic modes modifies the effective permittivity and permeability of the tuneable dielectric metasurface, exhibiting the high transmission and reflection that can be easily switched by simply changing the linear polarization.

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Ultrahigh refractive index sensitivity and tunable polarization switching via infrared plasmonic lattice modes

Cited by 28 publications

References 36 publications

Plasmonic Surface Lattice Resonances: A Review of Properties and Applications

Plasmonic Surface Lattice Resonances: A Review of Properties and Applications

Using Silver Nanoparticles-Embedded Silica Metafilms as Substrates to Enhance the Performance of Perovskite Photodetectors

Polarization control of high transmission/reflection switching by all-dielectric metasurfaces

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