Theoretical and experimental investigation of the emergence of surface states on photonic crystals as hybrid dielectric metasurface bound states of the termination layer

2020 ◽  
Author(s):  
A. C. Tasolamprou ◽  
L. Zhang ◽  
E. N. Economou ◽  
C. M. Soukoulis ◽  
Th. Koschny
Keyword(s):  
Experimental Investigation ◽  
Photonic Crystals ◽  
Bound States ◽  
Surface States ◽  
Dielectric Metasurface

scholarly journals Surface States on Photonic Crystals As Hybrid Dielectric Metasurface Bound States of the Termination Layer

ACS Photonics ◽  
2020 ◽  
Vol 7 (10) ◽  
pp. 2842-2849
Author(s):  
Anna C. Tasolamprou ◽  
Lei Zhang ◽  
Eleftherios N. Economou ◽  
Costas M. Soukoulis ◽  
Thomas Koschny
Keyword(s):  
Photonic Crystals ◽  
Bound States ◽  
Surface States ◽  
Dielectric Metasurface

scholarly journals All-Dielectric Metasurface for Sensing Microcystin-LR

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1363
Author(s):  
Binze Ma ◽  
Ao Ouyang ◽  
Juechen Zhong ◽  
Pavel A. Belov ◽  
Ravindra Kumar Sinha ◽  
...  
Keyword(s):  
Quality Factor ◽  
Bound States ◽  
High Sensitivity ◽  
Concentration Limit ◽  
Specific Recognition ◽  
Low Concentrations ◽  
Freshwater Bodies ◽  
Toxic Pollutant ◽  
Small Change ◽  
Dielectric Metasurface

Sensing Microcystin-LR (MC-LR) is an important issue for environmental monitoring, as the MC-LR is a common toxic pollutant found in freshwater bodies. The demand for sensitive detection method of MC-LR at low concentrations can be addressed by metasurface-based sensors, which are feasible and highly efficient. Here, we demonstrate an all-dielectric metasurface for sensing MC-LR. Its working principle is based on quasi-bound states in the continuum mode (QBIC), and it manifests a high-quality factor and high sensitivity. The dielectric metasurface can detect a small change in the refractive index of the surrounding environment with a quality factor of ~170 and a sensitivity of ~788 nm/RIU. MC-LR can be specifically identified in mixed water with a concentration limit of as low as 0.002 μg/L by a specific recognition technique for combined antigen and antibody. Furthermore, the demonstrated detection of MC-LR can be extended to the identification and monitoring of other analytes, such as viruses, and the designed dielectric metasurface can serve as a monitor platform with high sensitivity and high specific recognition capability.

scholarly journals Long-range focusing of magnetic bound states in superconducting lanthanum

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Howon Kim ◽  
Levente Rózsa ◽  
Dominik Schreyer ◽  
Eszter Simon ◽  
Roland Wiesendanger
Keyword(s):  
Long Range ◽  
Bound States ◽  
Theoretical Calculations ◽  
Surface States ◽  
Magnetic Interactions ◽  
Magnetic Impurities ◽  
Natural Choice ◽  
Temperature Scanning ◽  
Quantum Mechanical Systems ◽  
Low Dimensional

Abstract Quantum mechanical systems with long-range interactions between quasiparticles provide a promising platform for coherent quantum information technology. Superconductors are a natural choice for solid-state based quantum devices, while magnetic impurities inside superconductors give rise to quasiparticle excitations of broken Cooper pairs that provide characteristic information about the host superconductor. Here, we reveal that magnetic impurities embedded below a superconducting La(0001) surface interact via quasiparticles extending to very large distances, up to several tens of nanometers. Using low-temperature scanning probe techniques, we observe the corresponding anisotropic and giant oscillations in the LDOS. Theoretical calculations indicate that the quasi-two-dimensional surface states with their strongly anisotropic Fermi surface play a crucial role for the focusing and long-range extension of the magnetic bound states. The quasiparticle focusing mechanism should facilitate the design of versatile magnetic structures with tunable and directed magnetic interactions over large distances, thereby paving the way toward the design of low-dimensional magnet–superconductor hybrid systems exhibiting topologically non-trivial quantum states as possible elements of quantum computation schemes based on Majorana quasiparticles.

scholarly journals Andreev bound states in superconducting films and confined superfluid 3 He

2018 ◽  
Vol 376 (2125) ◽  
pp. 20150144 ◽  
Author(s):  
Anton B. Vorontsov
Keyword(s):  
Bound States ◽  
Surface States ◽  
Surface Region ◽  
Theme Issue ◽  
Confined Geometry ◽  
Andreev Bound States ◽  
Broken Symmetries ◽  
Parent State ◽  
Open Questions ◽  
Coherence Lengths

This paper reviews confinement-driven phase transitions in superconductors and Bardeen–Cooper–Schrieffer superfluids, and the appearance in thin films of new phases that break the time-reversal or translational symmetry. The origins of the new phases are closely tied to the Andreev scattering processes involving particle-hole conversions that create surface quasiparticle states with energies inside the superconducting gap. Restructuring of the low-energy spectrum in the surface region of several coherence lengths ξ 0 results in large spatial variations of the superconducting order parameter. In confined geometry, such as slabs, films, pores or nano-dots, with one or more physical dimensions D ∼10 ξ 0 , the Andreev bound states can dominate properties of a superconductor, leading to modified experimental signatures. They can significantly change the energy landscape, and drive transitions into new superconducting phases. The new phases are expected in a variety of materials, from singlet d -wave superconductors to multi-component triplet superfluid 3 He, but properties of the new phases will depend on the symmetry of the parent state. I will highlight the connection between the Andreev surface states and confinement-stabilized phases with additional broken symmetries, describe recent progress and open questions in the theoretical and experimental investigation of superfluids in confined geometry. This article is part of the theme issue ‘Andreev bound states’.

Sensitivity of surface states to the stack sequence of one-dimensional photonic crystals

2005 ◽  
Vol 7 (8) ◽  
pp. 374-381 ◽  
Author(s):  
Shuai Feng ◽  
Hong-Yi Sang ◽  
Zhi-Yuan Li ◽  
Bing-Ying Cheng ◽  
Dao-Zhong Zhang
Keyword(s):  
Photonic Crystals ◽  
Surface States ◽  
One Dimensional

Surface states in the optical spectra of two-dimensional photonic crystals with various surface terminations

2012 ◽  
Vol 86 (11) ◽  
Author(s):  
S. A. Dyakov ◽  
A. Baldycheva ◽  
T. S. Perova ◽  
G. V. Li ◽  
E. V. Astrova ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Surface States ◽  
Optical Spectra ◽  
Two Dimensional

Absorbing photonic crystals for silicon thin-film solar cells: Design, fabrication and experimental investigation

2011 ◽  
Vol 95 ◽  
pp. S32-S38 ◽  
Author(s):  
Xianqin Meng ◽  
Guillaume Gomard ◽  
Ounsi El Daif ◽  
Emmanuel Drouard ◽  
Regis Orobtchouk ◽  
...  
Keyword(s):  
Thin Film ◽  
Experimental Investigation ◽  
Solar Cells ◽  
Photonic Crystals ◽  
Thin Film Solar Cells ◽  
Silicon Thin Film
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