Spatiotemporal photonic crystals

Sharabi, Yonatan; Dikopoltsev, Alex; Lustig, Eran; Lumer, Yaakov; Segev, Mordechai

doi:10.1364/optica.455672

Cited by 54 publications

(29 citation statements)

References 38 publications

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“…Furthermore, it is shown that a metasurface-based PhTC can be excited externally by plane waves, amplifying both surface-bounded and free-space harmonics. The proposed metasurface platform can significantly simplify the construction and exploration of PhTCs, providing great convenience for probing the physics in PhTCs and photonic space-time crystals [28,29]. From the application point of view, the demonstrated metasurface PhTCs can become an important contribution to surface wave communications, serving as a "filling station" for surface-wave signals.…”

Section: Discussionmentioning

confidence: 99%

Metasurface-Based Realization of Photonic Time Crystals

Wang¹,

Mirmoosa²,

Asadchy³

et al. 2022

Preprint

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Photonic time crystals are artificial materials whose electromagnetic properties are uniform in space but periodically vary in time. The synthesis of such materials and experimental observation of their physics remain very challenging. In this work, we extend the concept of photonic time crystals to metasurfaces. We demonstrate that time-varying metasurfaces preserve key physical properties of volumetric time crystals, in particular, generating momentum bandgaps for surface and free-space waves. Moreover, in sharp contrast to bulk time-crystals, the momentum bandgap can be directly accessed by free-space excitations, significantly simplifying the crystal implementation and its exploitation. Based on a microwave metasurface design, we achieved the first experimental confirmation of exponential wave amplification inside a momentum bandgap. The proposed metasurface serves as a universal material platform for realizing exotic photonic space-time crystals and providing low-noise amplification for surface wave signals in future 6G wireless communications.

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Section: Discussionmentioning

confidence: 99%

Metasurface-Based Realization of Photonic Time Crystals

Wang¹,

Mirmoosa²,

Asadchy³

et al. 2022

Preprint

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show abstract

“…The spatial variations can be along one, two, or three dimensions. Photonic crystal properties can even be variable with time (the co-called spatiotemporal photonic crystals [ 57 ]).…”

Section: Photonic Crystals Based On Nanomembranesmentioning

confidence: 99%

Bio-Inspired Nanomembranes as Building Blocks for Nanophotonics, Plasmonics and Metamaterials

2022

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Nanomembranes are the most widespread building block of life, as they encompass cell and organelle walls. Their synthetic counterparts can be described as freestanding or free-floating structures thinner than 100 nm, down to monatomic/monomolecular thickness and with giant lateral aspect ratios. The structural confinement to quasi-2D sheets causes a multitude of unexpected and often counterintuitive properties. This has resulted in synthetic nanomembranes transiting from a mere scientific curiosity to a position where novel applications are emerging at an ever-accelerating pace. Among wide fields where their use has proven itself most fruitful are nano-optics and nanophotonics. However, the authors are unaware of a review covering the nanomembrane use in these important fields. Here, we present an attempt to survey the state of the art of nanomembranes in nanophotonics, including photonic crystals, plasmonics, metasurfaces, and nanoantennas, with an accent on some advancements that appeared within the last few years. Unlimited by the Nature toolbox, we can utilize a practically infinite number of available materials and methods and reach numerous properties not met in biological membranes. Thus, nanomembranes in nano-optics can be described as real metastructures, exceeding the known materials and opening pathways to a wide variety of novel functionalities.

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“…In wake of tremendous scientific and technological advancements in the last decade, photonic time crystals (PTCs) have been introduced as a distinct tool for light manipulation with unique features opening up new avenues in the domain of photonics. PTCs are systems where the refractive index (n) varies periodically with time [1,2], the study of which has brought light to many underlying features like temporal localization in between two PTCs with dissimilar topologies [3], localization of pulses and exponential decay in group velocity of a pulse in disordered PTCs [4], exceptional points in spatio-temporal crystals [5], and more with their intriguing physics. The concept of PTCs, so far, has been demonstrated in transmission lines for radio frequencies [6] and tremendous efforts are being put forward towards their realisation in optical regime using transparent conducting oxides (TCOs) [7].…”

mentioning

confidence: 99%

Momentum controlled optical pulse amplification in photonic time crystals

Snehashis¹,

Ghosh²

2023

Preprint

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We show that by manipulating the momentum (k) of a propagating optical pulse, the intensity can be controlled and highly enhanced in a linear binary photonic time crystal (PTC) system. The optical pulse equipped with k lying within the bandgap of the PTC gets amplified and gives rise to reflected and transmitted pulses with an equal growth in intensity moving in opposite directions. We predict and quantify the amount of amplification of the transmitted and reflected pulse and show the amplifications achieve a maximum at the centre of the k-gap accompanied by weaker growth in intensity at the edges. The maximum growth in the intensity of the optical pulses attains different values for different ranges of k-gaps in such systems. Such precise control over the amplification of propagating pulse can be exploited exclusively by tailoring the wave vector of the pulse and open a unique platform for light manipulation in futuristic unconventional active photonic devices.

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Spatiotemporal photonic crystals

Cited by 54 publications

References 38 publications

Metasurface-Based Realization of Photonic Time Crystals

Metasurface-Based Realization of Photonic Time Crystals

Bio-Inspired Nanomembranes as Building Blocks for Nanophotonics, Plasmonics and Metamaterials

Momentum controlled optical pulse amplification in photonic time crystals

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