Controlling the Electromagnetic Field Confinement with Metamaterials

Bonache, Jordi; Zamora, Gerard; Paredes, Ferran; Zuffanelli, Simone; Aguila, Pau; Martín, Ferrán

doi:10.1038/srep37739

Cited by 9 publications

(7 citation statements)

References 27 publications

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“…The currently available materials do not allow realizing a large manifold of concepts initially developed for plasmonics and microwave metamaterials, due to either large metallic losses or unavailability of materials with sufficiently large refractive index response at optical wavelengths. This issue presently confines conceptual demonstrations of many metaphotonics ideas at microwave frequencies. − …”

Section: Introductionmentioning

confidence: 99%

Inverse-Designed Metaphotonics for Hypersensitive Detection

2022

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Controlling the flow of broadband electromagnetic energy at the nanoscale remains a critical challenge in optoelectronics. Surface plasmon polaritons (or plasmons) provide subwavelength localization of light but are affected by significant losses. On the contrary, dielectrics lack a sufficiently robust response in the visible to trap photons similar to metallic structures. Overcoming these limitations appears elusive. Here we demonstrate that addressing this problem is possible if we employ a novel approach based on suitably deformed reflective metaphotonic structures. The complex geometrical shape engineered in these reflectors emulates nondispersive index responses, which can be inverse-designed following arbitrary form factors. We discuss the realization of essential components such as resonators with an ultrahigh refractive index of n = 100 in diverse profiles. These structures support the localization of light in the form of bound states in the continuum (BIC), fully localized in air, in a platform in which all refractive index regions are physically accessible. We discuss our approach to sensing applications, designing a class of sensors where the analyte directly contacts areas of ultrahigh refractive index. Leveraging this feature, we report an optical sensor with sensitivity two times higher than the closest competitor with a similar micrometer footprint. Inversely designed reflective metaphotonics offers a flexible technology for controlling broadband light, supporting optoelectronics' integration with large bandwidths in circuitry with miniaturized footprints.

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Section: Introductionmentioning

confidence: 99%

Inverse-Designed Metaphotonics for Hypersensitive Detection

2022

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Section: Introductionmentioning

confidence: 99%

Inverse-designed metaphotonics for hypersensitive detection

Elizarov¹,

Kivshar²,

Fratalocchi³

2022

Preprint

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Controlling the flow of broadband electromagnetic energy at the nanoscale remains a critical challenge in optoelectronics. Surface plasmon polaritons (or plasmons) provide subwavelength localization of light, but are affected by significant losses. On the contrary, dielectrics lack a sufficiently robust response in the visible to trap photons similar to metallic structures. Overcoming these limitations appears elusive, as it implies devising a path to circumvent causality in the quantum-mechanical form of matter. Here we demonstrate that addressing this problem is possible if we employ a novel approach based on suitably deformed reflective metaphotonic structures. The complex geometrical shape engineered in these reflectors emulates nondispersive index responses, which can be inverse-designed following arbitrary form factors. We discuss the realization of essential components such as resonators with an ultra-high refractive index of n = 100 in diverse profiles. These structures support localization of light in the form of bound states in the continuum (BIC), fully localized in air, in a platform in which all refractive index regions are physically accessible. We discuss our approach to sensing applications, designing a class of sensors where the analyte directly contacts areas of ultra-high refractive index. Leveraging this feature, we report differential sensitivities up to 350 nm/RIU in structures with footprints of approximately one micron. These performances are two times better than the closest competitor with a similar form factor. Inversely designed reflective metaphotonics offers a flexible technology for controlling broadband light, supporting optoelectronics' integration with large bandwidths in circuitry with miniaturized footprints.

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“…In particular, the control of the EM field in the radiofrequency (RF) range has become essential for the increasing antenna technologies, information networks, and Internet of Things [17]. In this regard, more than one century of experience accompanies the development of RF devices since the invention of the antenna [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, more than one century of experience accompanies the development of RF devices since the invention of the antenna [18,19]. However, modern technologies like Radio Frequency Identification (RFID) or Near-Field Communication (NFC) demand continuous device efficiency and miniaturization [17,20]. Simplest designs would also be beneficial.…”

Section: Introductionmentioning

confidence: 99%

“…These devices can be considered as plasmonic metamaterials [25] that use altered geometries to achieve an average plasmonic behavior in the RF domain. However, they in general involve complex designs and are poorly versatile since they are built upon a fixed geometry [17,24,26,27]. Complex designs can lead to a difficult comprehension of the phenomena involved and a difficult comparison with the knowledge in conventional antennas [19].…”

Section: Introductionmentioning

confidence: 99%

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Radioplasmonics: design of plasmonic milli-particles in air and absorbing media for antenna communication and human-body in-vivo applications.

Abraham-Ekeroth¹

2021

Preprint

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Surface plasmons with MHz-GHz energies are predicted by using milliparticles made of metamaterials that behave like metals in the radiofrequency range. In this work, the so-called Radioplasmonics is exploited to design scatterers embedded in different realistic media with tunable absorption or scattering properties. High-quality scattering/absorption based on plasmon excitation is demonstrated through a few simple examples, useful to build antennas with better performance than conventional ones. Systems embedded in absorbing media as saline solutions or biological tissues are also considered to improve biomedical applications and contribute with real-time, in-vivo monitoring tools in body tissues. In this regard, any possible implementation is criticized by calculating the radiofrequency heating with full thermal simulations. As proof of the versatility offered by radioplasmonic systems, plasmon “hybridization” is used to enhance near-fields to unprecedented values or to tune resonances as in optical spectra, minimizing the heating effects. Finally, a monitorable drug-delivery in human tissue is illustrated with a hypothetical example. This study has remarkable consequences on the conception of plasmonics at macroscales. The recently-developed concept of “spoof” plasmons achieved by complicated structures is simplified in Radioplasmonics since bulk materials with elemental geometries are considered.

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Controlling the Electromagnetic Field Confinement with Metamaterials

Cited by 9 publications

References 27 publications

Inverse-Designed Metaphotonics for Hypersensitive Detection

Inverse-Designed Metaphotonics for Hypersensitive Detection

Inverse-designed metaphotonics for hypersensitive detection

Radioplasmonics: design of plasmonic milli-particles in air and absorbing media for antenna communication and human-body in-vivo applications.

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