The role of Ge2Sb2Te5 in enhancing the performance of functional plasmonic devices

Gerislioglu, Burak; Bakan, Gökhan; Ahuja, Rajeev; Adam, Jost; Mishra, Yogendra Kumar; Ahmadivand, Arash

doi:10.1016/j.mtphys.2020.100178

Cited by 88 publications

(53 citation statements)

References 169 publications

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“…Special gold nanostructures on gold metal films that show a highly sensitive refractive index response, due to the high local field enhancement in their inter particle junction, have been recently reported [ 59 ]. It is interesting to mention the use of phase-change materials in tailoring efficient and tunable plasmonic devices [ 60 ].…”

Section: Discussionmentioning

confidence: 99%

Gold Nano-Island Platforms for Localized Surface Plasmon Resonance Sensing: A Short Review

et al. 2020

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Nano-islands are entities (droplets or other shapes) that are formed by spontaneous dewetting (agglomeration, in the early literature) of thin and very thin metallic (especially gold) films on a substrate, done by post-deposition heating or by using other sources of energy. In addition to thermally generated nano-islands, more recently, nanoparticle films have also been dewetted, in order to form nano-islands. The localized surface plasmon resonance (LSPR) band of gold nano-islands was found to be sensitive to changes in the surrounding environment, making it a suitable platform for sensing and biosensing applications. In this review, we revisit the development of the concept of nano-island(s), the thermodynamics of dewetting of thin metal films, and the effect of the substrate on the morphology and optical properties of nano-islands. A special emphasis is made on nanoparticle films and their applications to biosensing, with ample examples from the authors’ work.

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Section: Discussionmentioning

confidence: 99%

Gold Nano-Island Platforms for Localized Surface Plasmon Resonance Sensing: A Short Review

et al. 2020

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“…Since the surface conductivity can be tuned via shifting Fermi level under external bias voltage, graphene is commonly used in active THz metamaterials devices [34][35][36] and it is a good method to incorporate graphene with dielectric metasurfaces for active tunability [37]. Furthermore, phase-change materials are capable of providing great variations in material properties during the phase transition and can be used to design dynamic THz devices [38,39]. As one of the most popular ferroelectric phase-change materials, strontium titanate (SrTiO 3 , STO), with a strong ferroelectric soft mode, its dielectric behavior in the THz range can be fully controlled by external temperatures [11,40,41].…”

Section: Introductionmentioning

confidence: 99%

Tunable Bound States in the Continuum in All-Dielectric Terahertz Metasurfaces

Chen

Wang

2020

Nanomaterials

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In this paper, a tunable terahertz dielectric metasurfaces consisting of split gap bars in the unit cell is proposed and theoretically demonstrated, where the sharp high-quality Fano resonance can be achieved through excitation of quasi-bound states in the continuum (quasi-BIC) by breaking in-plane symmetry of the unit cell structure. With the structural asymmetry parameter decreasing and vanishing, the calculated eigenmodes spectra demonstrate the resonance changes from Fano to symmetry-protected BIC mode, and the radiative quality factors obey the inverse square law. Moreover, combining with graphene monolayer and strontium titanate materials, the quasi-BIC Fano resonance can be tuned independently, where the resonance amplitude can be tuned by adjusting the Fermi level of graphene and the resonance frequency can be tuned by controlling the temperature of strontium titanate materials. The proposed structure has numerous potential applications on tunable devices including modulators, switches, and sensors.

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“…VO 2 has been applied to the frequency control of plasmonic antenna arrays [152][153][154][155], free-space phase [156,157], amplitude [158][159][160][161][162] and polarization [163] modulators, plasmonic color generation [164,165], adaptive thermal camouflage [166], tunable absorbers and emitters [167][168][169][170][171], and free-form metadevices [134]. Compared to VO 2 , chalcogenide O-PCMs exemplified by GST offer even larger optical contrast in the near-IR and UV spectral regimes with an index change up to 2.8 [172][173][174][175][176]. In addition to tuning response of identical metaatom arrays [177][178][179][180][181][182][183][184][185][186][187][188][189], advanced active control of metasurface devices, including varifocal metalenses [190][191][192][193], metasurface color display [194], spatial light modulators…”

Section: Optical Phase-change Mediamentioning

confidence: 99%

Design for quality: reconfigurable flat optics based on active metasurfaces

et al. 2020

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Optical metasurfaces, planar subwavelength nanoantenna arrays with the singular ability to sculpt wavefront in almost arbitrary manners, are poised to become a powerful tool enabling compact and high-performance optics with novel functionalities. A particularly intriguing research direction within this field is active metasurfaces, whose optical response can be dynamically tuned postfabrication, thus allowing a plurality of applications unattainable with traditional bulk optics. Designing reconfigurable optics based on active metasurfaces is, however, presented with a unique challenge, since the optical quality of the devices must be optimized at multiple optical states. In this article, we provide a critical review on the active meta-optics design principles and algorithms that are applied across structural hierarchies ranging from single meta-atoms to full meta-optical devices. The discussed approaches are illustrated by specific examples of reconfigurable metasurfaces based on optical phase-change materials.

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The role of Ge2Sb2Te5 in enhancing the performance of functional plasmonic devices

Cited by 88 publications

References 169 publications

Gold Nano-Island Platforms for Localized Surface Plasmon Resonance Sensing: A Short Review

Gold Nano-Island Platforms for Localized Surface Plasmon Resonance Sensing: A Short Review

Tunable Bound States in the Continuum in All-Dielectric Terahertz Metasurfaces

Design for quality: reconfigurable flat optics based on active metasurfaces

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