Antireflection temporal coatings

Pacheco‐Peña, Víctor; Engheta, Nader

doi:10.1364/optica.381175

Cited by 161 publications

(71 citation statements)

References 47 publications

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“…Remarkably, an analogy between this temporal and the spatial interface between two materials with different electromagnetic parameters was demonstrated, showing that the two waves created at a temporal boundary (FW and BW) are the temporal equivalent/analogy to the transmitted and reflected waves in spatial interfaces. In this realm, temporal and spatiotemporal metamaterials have recently been proposed and applied in several exciting and intriguing applications, such as effective medium theory 45 , inverse prisms 46 , nonreciprocity 47,48 , anti-reflection temporal coatings 49 , frequency conversion 50 and time reversal 51 .…”

Section: Introductionmentioning

confidence: 99%

Temporal aiming

2020

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Deflecting and changing the direction of propagation of electromagnetic waves are needed in multiple applications, such as in lens-antenna systems, point-to-point communications and radars. In this realm, metamaterials have been demonstrated to be great candidates for controlling wave propagation and wave-matter interactions by offering manipulation of their electromagnetic properties at will. They have been studied mainly in the frequency domain, but their temporal manipulation has become a topic of great interest during the past few years in the design of spatiotemporally modulated artificial media. In this work, we propose an idea for changing the direction of the energy propagation of electromagnetic waves by using time-dependent metamaterials, the permittivity of which is rapidly changed from isotropic to anisotropic values, an approach that we call temporal aiming. In so doing, here, we show how the direction of the Poynting vector becomes different from that of the wavenumber. Several scenarios are analytically and numerically evaluated, such as plane waves under oblique incidence and Gaussian beams, demonstrating how proper engineering of the isotropic-anisotropic temporal function of ε r (t) can lead to a redirection of waves to different spatial locations in real time.

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Section: Introductionmentioning

confidence: 99%

Temporal aiming

2020

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“…The research on time-varying electromagnetic platforms has a long history dating back to 1950s, when one of the early works, by Morgenthaler [17], explored theoretically what would happen to a monochromatic electromagnetic wave in a medium when the medium's phase velocity is rapidly changed in time. In the past decades, there have been numerous efforts in investigating various phenomena related to the temporal variation of electromagnetic media, providing temporal boundaries [18], temporal holography [19], Doppler cloaking [20], temporal band gaps [21][22][23], temporal effective medium concept [24], temporal impedance matching [25,26], Fresnel drag in spatiotemporal metamaterials [27], spacetime cloaks [28,29], modeling time and causality with metamaterials [30,31], rapidly growing plasma and accelerating reference frame [32], and exceptional points in timevarying media [33], just to name a few.…”

Section: Main Textmentioning

confidence: 99%

Metamaterials with high degrees of freedom: space, time, and more

Engheta

2020

Nanophotonics

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“…Incorporation of metamaterials into on-chip photonic devices can tune the performance of a waveguide, such as reducing waveguide facet reflection losses with antireflective structures [23,24], engineering the waveguide effective index to convert the propagating modes [25], and 'hiding carpet' cloaking an object on a chip [6]. Here, we overview the phenomena associated with the propagation and manipulation of light in dielectric waveguides, waveguides with plasmonic overlayer or metamaterials on waveguides.…”

Section: Introductionmentioning

confidence: 99%

On-chip nanophotonics and future challenges

et al. 2020

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On-chip nanophotonic devices are a class of devices capable of controlling light on a chip to realize performance advantages over ordinary building blocks of integrated photonics. These ultra-fast and low-power nanoscale optoelectronic devices are aimed at high-performance computing, chemical, and biological sensing technologies, energy-efficient lighting, environmental monitoring and more. They are increasingly becoming an attractive building block in a variety of systems, which is attributed to their unique features of large evanescent field, compactness, and most importantly their ability to be configured according to the required application. This review summarizes recent advances of integrated nanophotonic devices and their demonstrated applications, including but not limited to, mid-infrared and overtone spectroscopy, all-optical processing on a chip, logic gates on a chip, and cryptography on a chip. The reviewed devices open up a new chapter in on-chip nanophotonics and enable the application of optical waveguides in a variety of optical systems, thus are aimed at accelerating the transition of nanophotonics from academia to the industry.

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Antireflection temporal coatings

Cited by 161 publications

References 47 publications

Temporal aiming

Temporal aiming

Metamaterials with high degrees of freedom: space, time, and more

On-chip nanophotonics and future challenges

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