Bound States in the Continuum Empower Subwavelength Gratings for Refractometers in Visible

Yadav, Gunjan; Sahu, Sanjay Kumar; Kumar, Ritesh; Jha, Rajan

doi:10.3390/photonics9050292

Cited by 13 publications

(3 citation statements)

References 52 publications

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“…However, 2D and 3D ones (such as photonic-crystal slabs and metasurfaces) are very popular objects in the BIC and Fano studies. As several further examples, we mention grating-assisted ring resonators [31] and sensor devices [32,33], coupled resonators [34], mesoscale particle-based systems [35] and many more.…”

Section: Discussionmentioning

confidence: 99%

Bound States in the Continuum versus Fano Resonances: Topological Argument

Novitsky

2022

Photonics

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There is a recent surge of interest to the bound states in the continuum (BICs) due to their ability to provide high-quality resonances in open photonic systems. They are usually observed in perturbed systems possessing Fano resonances in their spectra. We argue that, generally speaking, the Fano resonances should not be considered as a proxy for BICs (as it is often done) due to their fundamentally different topological properties. This difference is illustrated with the non-Hermitian layered structure supporting both topologically nontrivial quasi-BIC and topologically trivial Fano resonances. Non-Hermiticity can also be a source of additional topological features of these resonant responses. Moreover, the lasing mode associated with BIC in this structure also possesses nonzero topological charge that can be useful for producing unconventional states of light. This paper contributes to the discussion of BIC physics and raises new questions concerning topological properties of non-Hermitian systems.

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Section: Discussionmentioning

confidence: 99%

Bound States in the Continuum versus Fano Resonances: Topological Argument

Novitsky

2022

Photonics

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“…In recent years, optical fiber based techniques in conjunction with nanotechnology have emerged as successful and efficient platforms for developing sensing devices. − Sensor research based on tapered optical fibers (TOFs) is growing rapidly. Due to their small size and the enhanced evanescent field distribution in the tapered region, TOFs have been implemented for detection of molecules and nanoparticles. , There are a number of well-known techniques for radiation sensing, depending on the underlying working principles.…”

Section: Introductionmentioning

confidence: 99%

Detection of Energetic Ions Based on Tapered Optical Fiber

Rajbhar

Maharana

Patra

et al. 2023

ACS Appl. Opt. Mater.

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Single-mode tapered optical fibers (TOF) are well-known for applications in sensing. In this work, we demonstrate the use of tapered optical fibers to detect charged particles (ions) irradiated at various energies, fluences, and species. In this experiment, two different ion species, namely, Ar+ and N+, have been used to irradiate tapered optical fibers at various fluences and energies. The variations in the free spectral range (FSR), period, and transmission power loss from the ion beam irradiated TOFs are picked up by the optical spectrum analyzer (OSA). We were able to identify ions with energy as low as 80 keV because of the change in the refractive index of the cladding material caused by the implanted ions. The observed changes in spectra are explained using the results of COMSOL simulations. Using Monte Carlo-based TRI3DYN ion–solid interaction simulation, the surface modification and defect formation caused by ion beams as well as the implantation profile in the TOF have been predicted. These results are further corroborated by experimental studies such as scanning electron microscopy and Raman scattering spectroscopy. Such a tapered optical fiber-based detection method will aid in the creation of portable equipment to identify charged particles in nuclear reactors and in space exploration.

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“…Also named quasi-BICs (or QBICs), these modes have been widely used in sensing applications [113][114][115]. Latterly, different structures have been analyzed in order to get high-Q resonances, such as subwavelength gratings [116][117][118][119], coupled gratings [113,120], or photonic crystal slabs [121][122][123][124][125], even in conjunction with more intricate configurations [126].…”

Section: Introductionmentioning

confidence: 99%

Trapping flexural waves in thin elastic plates by complex engineered surfaces

Marc

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The main objective of this PhD thesis has been to design geometrical structures of resonators on top of a thin elastic plate for trapping waves that propagate through the medium in a reduced space. High density of modes in a wide frequency range is desired, as it can be appealing for developing mechanical wave control devices.Structures discussed throughout this work have been analysed using multiple scattering theory. This mathematical tool has proved to be really adequate when treating with point-like interactions between resonators and the continuum medium, as is the case in our systems.In the first place, a mechanical analogue for the twisted bilayer structure has been studied. This system is based on two periodic lattices superimposed with a relative rotation angle between them. It has recently attracted the attention of the scientific community due to its exotic properties as conductor/isolator. In this work, we will study a mechanism for describing the behavior of the eigenmodes of the structure based on the dimerized interaction between resonators.Quasi-periodic one-dimensional distribution of scatterers offers the possibility of confining waves that propagate through the medium, and presents robustness against disorder based on its topological protection. This work has proven the possibility of confining mechanical waves in a two-dimensional space using one-dimensional quasi-periodic structures, simplifying the necessary system for confining waves and showing similar results to the same kind of structures applied in other domains.Lastly, solutions for having bound states in the continuum (BICs) within a circular arrangement of scatterers have been studied and developed. These solutions to the wave equation allow to have infinite lifetime modes that do not propagate through the rest of the system, and therefore present perfect confinement. In this work, solutions have been found both for flexural waves in thin elastic plates, and for two-dimensional acoustic waveguides.

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Bound States in the Continuum Empower Subwavelength Gratings for Refractometers in Visible

Cited by 13 publications

References 52 publications

Bound States in the Continuum versus Fano Resonances: Topological Argument

Bound States in the Continuum versus Fano Resonances: Topological Argument

Detection of Energetic Ions Based on Tapered Optical Fiber

Trapping flexural waves in thin elastic plates by complex engineered surfaces

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