Optically Implemented Broadband Blueshift Switch in the Terahertz Regime

Shen, Nian‐Hai; Massaouti, Maria; Gökkavas, Mutlu; Manceau, Jean‐Michel; Özbay, Ekmel; Kafesaki, Maria; Koschny, Thomas; Tzortzakis, S.; Soukoulis, Costas M.

doi:10.1103/physrevlett.106.037403

Cited by 277 publications

(190 citation statements)

References 29 publications

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“…Therefore, the frequency of the SRR LC resonance is tuned to a lower frequency with the tuning range about 20% [167], as shown in figure 26(b). A variety of similar structures were used, for instance, resulting in blue-shifting of the resonance frequency [168]. Optically modifying the metasurface geometric structure enables the transition between different type of resonances.…”

Section: Actively Switchable and Frequency Tunable Semiconductor Hybrmentioning

confidence: 99%

A review of metasurfaces: physics and applications

2016

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Abstract. Metamaterials are composed of periodic subwavelength metal/dielectric structures that resonantly couple to the electric and/or magnetic components of the incident electromagnetic fields, exhibiting properties that not found in nature. This class of micro-and nano-structured artificial media have attracted great interest during the past 15 years and yielded ground-breaking electromagnetic and photonic phenomena. However, the high losses and strong dispersion associated with the resonant responses and the use of metallic structures, as well as the difficulty in fabricating the micro-and nanoscale 3D structures, have hindered practical applications of metamaterials. Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses. Metasurfaces enable a spatially varying optical response (e.g., scattering amplitude, phase, and polarization), mold optical wavefronts into shapes that can be designed at will, and facilitate the integration of functional materials to accomplish active control and greatly enhanced nonlinear response. This paper reviews recent progress in the physics of metasurfaces operating at wavelengths ranging from microwave to visible. We provide an overview of key metasurface concepts such as anomalous reflection and refraction, and introduce metasurfaces based on the PancharatnamBerry phase and Huygens' metasurfaces, as well as their use in wavefront shaping and beam forming applications, followed by a discussion of polarization conversion in fewlayer metasurfaces and their related properties. An overview of dielectric metasurfaces reveals their ability to realize unique functionalities coupled with Mie resonances and their low ohmic losses. We also describe metasurfaces for wave guidance and radiation control, as well as active and nonlinear metasurfaces. Finally, we conclude by providing our opinions of future developments in this rapidly developing research field.

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Section: Actively Switchable and Frequency Tunable Semiconductor Hybrmentioning

confidence: 99%

A review of metasurfaces: physics and applications

2016

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“…However, the relatively small nonlinear susceptibilities of inorganic emitters limit the THz emission intensity. Meanwhile, nonlinear metamaterials have been actively pursued [11][12][13][14][15][16][17][18][19] , and the recent development of metamaterials composed of split-ring resonators (SRRs) has enabled researchers to tailor resonant optical nonlinearities from the THz to the infrared and visible regions 20,21 . In this regard, investigating metamaterials with few tens of nanometres thickness exhibiting artificial optical magnetism-that is, sustaining circulating ring currents at optical frequencies-can meet the urgent demand for new nonlinear materials for optical rectification free from both quasi-phase-matching limitation and spurious THz phonon absorption.…”

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confidence: 99%

Broadband terahertz generation from metamaterials

et al. 2014

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The terahertz spectral regime, ranging from about 0.1-15 THz, is one of the least explored yet most technologically transformative spectral regions. One current challenge is to develop efficient and compact terahertz emitters/detectors with a broadband and gapless spectrum that can be tailored for various pump photon energies. Here we demonstrate efficient single-cycle broadband THz generation, ranging from about 0.1-4 THz, from a thin layer of split-ring resonators with few tens of nanometers thickness by pumping at the telecommunications wavelength of 1.5 mm (200 THz). The terahertz emission arises from exciting the magnetic-dipole resonance of the split-ring resonators and quickly decreases under off-resonance pumping. This, together with pump polarization dependence and power scaling of the terahertz emission, identifies the role of optically induced nonlinear currents in split-ring resonators. We also reveal a giant sheet nonlinear susceptibility B10 À 16 m 2 V À 1 that far exceeds thin films and bulk non-centrosymmetric materials.

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“…A recent study demonstrated blue-shift tunable metamaterials controlled by infra-red light intensity to reduce both the inductive and capacitive components. [ 16 ] In recent research, fl exible PEN fi lms were used as substrates to construct metamaterials for resonance enhancement and broadband resonance. [17][18][19] This kind of thin fl exible metamaterial can make metamaterials into non-planar form, allowing more potential designs and applications than the metamaterials made on rigid substrates.…”

Section: Doi: 101002/adma201104575mentioning

confidence: 99%