Optothermally Functional Charge Transfer Plasmon Modulator

Nooshnab, Vida; Ahmadivand, Arash

doi:10.1109/lpt.2017.2736251

Cited by 23 publications

(17 citation statements)

References 33 publications

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“…On the other hand, the induced CTPs via the direct transition of optically driven electrons across the bulk metallic paths between NPs suffer from the inherent lack of tunability. Recently, these challenges have effectively been addressed by using optoelectronically and optothermally tunable components in the purpose of the excitation of functional CTPs [43][44][45][46][47]77]. Such an active tunability allows for the exploration of several integrated plasmonic instruments and applications owing to its great potential for the next-generation multifunctional technology.…”

Section: Functional Charge Transfer Plasmonsmentioning

confidence: 99%

“…In spite of possessing interesting properties, CTPs are inherently suffering from lack of spectral tunability. Recent demonstrations that the functionality of CTP feature can be optimized by integrating bulk metallic systems with thermally and electronically controllable materials show why tunable CTP spectral features are important for implementing novel and advanced plasmonic tools [36,[43][44][45][46]. More precisely, this shortcoming has successfully been addressed by combining plasmonic structures with, for example, phase-change materials (PCMs) [43,44,47], graphene [45,46], and thermally tunable substances (i.e., InSb).…”

Section: Introductionmentioning

confidence: 99%

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Functional Charge Transfer Plasmon Metadevices

Gerislioglu

Ahmadivand

2020

Research

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Reducing the capacitive opening between subwavelength metallic objects down to atomic scales or bridging the gap by a conductive path reveals new plasmonic spectral features, known as charge transfer plasmon (CTP). We review the origin, properties, and trending applications of this modes and show how they can be well-understood by classical electrodynamics and quantum mechanics principles. Particularly important is the excitation mechanisms and practical approaches of such a unique resonance in tailoring high-response and efficient extreme-subwavelength hybrid nanophotonic devices. While the quantum tunneling-induced CTP mode possesses the ability to turn on and off the charge transition by varying the intensity of an external light source, the excited CTP in conductively bridged plasmonic systems suffers from the lack of tunability. To address this, the integration of bulk plasmonic nanostructures with optothermally and optoelectronically controllable components has been introduced as promising techniques for developing multifunctional and high-performance CTP-resonant tools. Ultimate tunable plasmonic devices such as metamodulators and metafilters are thus in prospect.

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Section: Functional Charge Transfer Plasmonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional Charge Transfer Plasmon Metadevices

Gerislioglu

Ahmadivand

2020

Research

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“…This unique feature was realized by using a phase‐changing material (Ge 2 Sb 2 Te 5 ) as a nanobridge that allows and controls the charge transfer between the metallic nanoparticles, via conductivity variations due to external heat stimuli. However, switching between amorphous and crystalline phases of a nonvolatile material needs for applying Joule heating at high temperatures (≳477 °C) . This hinders broad usage of phase‐changing material‐based controllable CTPs in integrated nanophotonic systems that are sensitive to high temperatures.…”

mentioning

confidence: 99%

“…However, switching between amorphous and crystalline phases of a nonvolatile material needs for applying Joule heating at high temperatures (0477 C). [15,16] This hinders broad usage of phase-changing material-based controllable CTPs in integrated nanophotonic systems that are sensitive to high temperatures.Recently, Frenzel et al [17] have shown that the photoconductivity of a monolayer graphene sheet can be controlled efficiently by applying bias via tuning the generated carrier density. Such a feature was achieved by modeling the electronic properties of graphene in terms of massless Dirac fermions.…”

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confidence: 99%

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Graphene Optical Switch Based on Charge Transfer Plasmons

Ahmadivand

Gerislioglu

Pala

2017

Physica Rapid Research Ltrs

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In the past decade, dynamic, tunable, compact, and fast plasmonic switches with high modulation depth (MD) and low losses have been developed successfully for various practical applications. Here, using a simple plasmonic dimer consisting of a pair of metallic nanodisks bridged to each other with a graphene monolayer, we develop a highly tunable plasmonic switch for telecommunication applications. We have shown that having active control on the photoconductivity of graphene sheet through electrical bias allows for transition of charges across the atomically thin bridge, giving rise to formation of charge transfer plasmon (CTP) modes. Such an interplay between semiconducting and semi‐metallic states of the graphene sublayer leads to direct control of the excited CTPs. By tuning the peak of CTP at the global telecommunication band (λ = 1550 nm), we designed an integrated, fast, and functional optoelectronic nanoswitch with high MD up to ≈98% and negligible losses. This study presents a promising approach to design tunable, high‐quality, integrated optoelectronic switches for next‐generation advanced nanophotonic applications.

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A Reversible Tuning of High Absorption in Chalcogenide–Metal Stacked‐Layer Structure and Its Application for Multichannel Biosensing

Behera

Liu

Lian

et al. 2021

Advanced Photonics Research

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Perfect absorption ranging from visible, infrared, terahertz, to microwave is desirable for solar cell, photodetection, telecommunications, and molecular sensing. Recently, the air/dielectric–metal stacks/substrate‐based asymmetric Fabry–Pérot (FP) cavity has attracted much attention owing to lithography‐free design which is scalable and low cost. Herein, a reversibly tunable asymmetric FP cavity high absorber in the near‐infrared (NIR) region is experimentally demonstrated, relying on chalcogenide (Ge2Sb2Te5)–metal (Au) stacked layers. It exhibits an extremely high absorptance of 0.99 at a resonant wavelength of 1180 nm for amorphous (AM) state; yet, the peak absorptance redshifts to 1680 nm for crystalline (CR) state. Importantly, it takes about 5 ns to reversibly transit the peak absorptance by reamorphizing the GST225. It is also experimentally shown the Brewster modes can be excited in the cavity absorber, and a wide tuning of Brewster modes (from 820 to 1500 nm) is realized as switching the state between AM and CR. The Goos–Hänchen (GH) shift can be observed at the Brewster angle for each state. For the proof of concept multibiosensing application, the cavity to detect two different solutions of the copper sulfate and glucose in both AM and CR states is numerically functionalized, respectively.

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Optothermally Functional Charge Transfer Plasmon Modulator

Cited by 23 publications

References 33 publications

Functional Charge Transfer Plasmon Metadevices

Functional Charge Transfer Plasmon Metadevices

Graphene Optical Switch Based on Charge Transfer Plasmons

A Reversible Tuning of High Absorption in Chalcogenide–Metal Stacked‐Layer Structure and Its Application for Multichannel Biosensing

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