Deep Optical Switching on Subpicosecond Timescales in an Amorphous Ge Metamaterial

Lemasters, Robert; Shcherbakov, Maxim R.; Yang, Guoce; Song, Jia; Lian, Tianquan; Harutyunyan, Hayk; Shvets, Gennady

doi:10.1002/adom.202100240

Cited by 8 publications

(8 citation statements)

References 43 publications

(68 reference statements)

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“…Shifts in the resonance of a photonic crystal 228 were demonstrated, as well as in Mie-resonant systems, in a range of materials ranging from Si [229][230][231] to GaAs, 232 GaP, 233 and Ge. 234 GaAs exhibits stronger modulation efficiencies as it features a direct bandgap in the visible to near-IR region, while Si, GaP and Ge rely on indirect band gap transitions, less efficient for this class of materials. 232 Time-refraction was observed both in Si 235 and GaAs 236 high-Q nanoantenna metasurfaces.…”

Section: High-index Dielectric Metasurfaces As Time-varying Mediamentioning

confidence: 99%

Photonics of time-varying media

et al. 2022

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Time-varying media have recently emerged as a new paradigm for wave manipulation, due to the synergy between the discovery of highly nonlinear materials, such as epsilon-near-zero materials, and the quest for wave applications, such as magnet-free nonreciprocity, multimode light shaping, and ultrafast switching. In this review, we provide a comprehensive discussion of the recent progress achieved with photonic metamaterials whose properties stem from their modulation in time. We review the basic concepts underpinning temporal switching and its relation with spatial scattering and deploy the resulting insight to review photonic time-crystals and their emergent research avenues, such as topological and non-Hermitian physics. We then extend our discussion to account for spatiotemporal modulation and its applications to nonreciprocity, synthetic motion, giant anisotropy, amplification, and many other effects. Finally, we conclude with a review of the most attractive experimental avenues recently demonstrated and provide a few perspectives on emerging trends for future implementations of time-modulation in photonics.

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Section: High-index Dielectric Metasurfaces As Time-varying Mediamentioning

confidence: 99%

Photonics of time-varying media

et al. 2022

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“…Integrating 2D materials with nanostructured dielectrics may also help achieve higher modulation depths at lower pump energies, , as sub-20 fs differential reflectivity modulations of a few percent have already been demonstrated in 2D hybrid perovskite thin layers . Most of the research effort in this field is, however, now put on the more efficient free-carrier effects for picosecond modulation at the incident or emitted wavelengths. − …”

Section: Conclusion and Perspectivesmentioning

confidence: 99%

Nonlinear Dielectric Nanoantennas and Metasurfaces: Frequency Conversion and Wavefront Control

Grinblat

2021

ACS Photonics

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High-index dielectric nanostructures can support optical resonances of electric and magnetic character with ultralow linear absorption. In contrast to plasmonics, they can be engineered to confine electromagnetic fields inside the resonator, amplifying intrinsic nonlinearities of the dielectric. In this Review I examine the ability of dielectric nanoantennas and metasurfaces for efficient harmonic generation and wave-mixing processes, as well as nonlinear wavefront manipulation of the incident and radiated light. A detailed comparison is made between the many nanoscopic dielectric configurations reported in the literature, evaluating the influence of the material, crystal symmetry, structure geometry, and the different resonances involved (electric and magnetic Mie modes, Fano resonances, and quasi-nonradiative states, including anapoles and quasi-bound states in the continuum). The nonlinear performance of the nanosystems is analyzed, with emphasis on frequency conversion efficiency and emission directionality control, also discussing recent advances in nonlinear imaging, nonlinear holography, and all-optical switching. The role of topology in nonlinear nanophotonics is reviewed in the end, and potential future directions in the field are laid out.

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“…materials, that is, materials whose optical properties can be tuned by external physical stimuli, are highly sought after as they allow spatiotemporal control of light to create new functionalities in sensing, imaging and display applications. Notable examples of reconfigurable materials include transparent conducting oxides [5][6][7], semiconductors [8][9][10], as well as polymers [11,12], whose free carrier concentrations or carrier effective mobilities can be tuned by optical excitation, electrical gating, or electrochemical gating.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast infrared plasmon switching in aligned carbon-nanotube optical resonators

Li¹,

Ho²,

Falk³

et al. 2022

J. Opt.

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Reconfigurable plasmonic materials are crucial components in active photonic devices for optical communication, signal processing, and sensing applications. Certain candidates including transparent conducting oxides, small-bandgap semiconductors (i.e., Ge, InSb), and conducting polymers can exhibit switchable free carrier concentrations triggered by optical, electrical or thermal excitation. Here, we show that aligned films of single-walled carbon nanotubes (CNTs) serve as all-optically tunable plasmonic material in the mid-infrared range, thereby adding them to the library of switchable plasmonic materials. Interband optical pumping with femtosecond laser pulses results in the photoexcitation of free charge carriers, which transiently blueshifts the plasmon resonances of patterned, periodic CNT nano-resonators spanning the mid-infrared spectral range from 1700 cm-1 to 2700 cm-1. The ultrafast plasmon modulation exhibits a nearly single-picosecond decay time, attributed to interband carrier relaxation and inter-tube charge transfer. Given that aligned films of CNTs have high thermal stability, excellent photostability, epsilon-near-zero property, and extremely large optical anisotropy, their dynamic tunability represents a promising pathway towards active optical devices in the technologically important infrared range.

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Deep Optical Switching on Subpicosecond Timescales in an Amorphous Ge Metamaterial

Cited by 8 publications

References 43 publications

Photonics of time-varying media

Photonics of time-varying media

Nonlinear Dielectric Nanoantennas and Metasurfaces: Frequency Conversion and Wavefront Control

Ultrafast infrared plasmon switching in aligned carbon-nanotube optical resonators

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