scholarly journals Surface Plasmon Resonances in Sierpinski-Like Photonic Crystal Fibers: Polarization Filters and Sensing Applications

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4654
Author(s):  
William O. F. Carvalho ◽  
J. R. Mejía-Salazar
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Surface Plasmon ◽  
Wavelength Range ◽  
Circular Cross Section ◽  
Wide Band ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Plasmon Resonances

We investigate the plasmonic behavior of a fractal photonic crystal fiber, with Sierpinski-like circular cross-section, and its potential applications for refractive index sensing and multiband polarization filters. Numerical results were obtained using the finite element method through the commercial software COMSOL Multiphysics®. A set of 34 surface plasmon resonances was identified in the wavelength range from λ=630 nm to λ=1700 nm. Subsets of close resonances were noted as a consequence of similar symmetries of the surface plasmon resonance (SPR) modes. Polarization filtering capabilities are numerically shown in the telecommunication windows from the O-band to the L-band. In the case of refractive index sensing, we used the wavelength interrogation method in the wavelength range from λ=670 nm to λ=790 nm, where the system exhibited a sensitivity of S(λ)=1951.43 nm/RIU (refractive index unit). Due to the broadband capabilities of our concept, we expect that it will be useful to develop future ultra-wide band optical communication infrastructures, which are urgent to meet the ever-increasing demand for bandwidth-hungry devices.

scholarly journals Tuning the Fano Resonance Between Localized and Propagating Surface Plasmon Resonances for Refractive Index Sensing Applications

Plasmonics ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 1379-1385 ◽  
Author(s):  
Kristof Lodewijks ◽  
Jef Ryken ◽  
Willem Van Roy ◽  
Gustaaf Borghs ◽  
Liesbet Lagae ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Fano Resonance ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Plasmon Resonances

Scaling of Surface Plasmon Resonances in Triangular Silver Nanoplate Sols for Enhanced Refractive Index Sensing

Plasmonics ◽  
2011 ◽  
Vol 6 (2) ◽  
pp. 351-362 ◽  
Author(s):  
Denise E. Charles ◽  
Matthew Gara ◽  
Damian Aherne ◽  
Deirdre M. Ledwith ◽  
John M. Kelly ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Plasmon Resonances

scholarly journals Refractive Index Sensing of Monolayer Molecules Using Both Local and Propagating Surface Plasmons in Mid-Infrared Metagrating

2019 ◽  
Vol 9 (8) ◽  
pp. 1524 ◽  
Author(s):  
De He ◽  
Tieyan Zhang ◽  
Lu Liu ◽  
Shixing Guo ◽  
Zhijun Liu
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Spectral Band ◽  
Broad Band ◽  
Surface Plasmon Resonances ◽  
Molecular Fingerprint ◽  
Mid Infrared ◽  
Refractive Index Sensing ◽  
Metal Insulator Metal ◽  
Plasmon Resonances

Surface-enhanced infrared absorption spectroscopy (SEIRA) is attractive for molecular sensing due to its high sensitivity and access to molecular fingerprint absorptions. In this paper, we report on refractive index sensing of monolayer molecules in a spectral band outside the molecular fingerprint region. In a metagrating composed of a three-layer metal-insulator-metal structure, both propagating surface plasmon resonances (PSPs) and local surface plasmon resonances (LSPRs) are exited from free-space in a broad band of 3 to 9 µm, and their sensing properties are characterized. In response to a self-assembled monolayer of octadecanethiol (ODT) molecules, both PSPs and LSPRs exhibit redshifts in wavelength. The shifts of LSPRs are larger than those of PSPs, as originated from their stronger spatial confinement and larger field enhancement. Our proposed mid-infrared molecular sensor is immune to frequency variations of plasmon resonance and more tolerant to sample feature size variation.

scholarly journals Surface Plasmon Resonances in Silver Nanostars

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3821 ◽  
Author(s):  
Faustino Reyes Gómez ◽  
Rafael Rubira ◽  
Sabrina Camacho ◽  
Cibely Martin ◽  
Robson da Silva ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Localized Surface Plasmon Resonances ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Difference Time

The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths ( λ ≳ 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications.

scholarly journals Exploiting Localized Surface Plasmon Resonances in Subwavelength Spiral Disks for THz Thin Film Sensing

2020 ◽  
Vol 10 (10) ◽  
pp. 3595
Author(s):  
Vasily V. Gerasimov ◽  
Ruslan R. Hafizov ◽  
Sergei A. Kuznetsov ◽  
Pavel A. Lazorskiy
Keyword(s):  
Surface Plasmon ◽  
Low Frequency ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Localized Surface Plasmon Resonances ◽  
Sensing Applications ◽  
Plasmon Resonances ◽  
High Figure ◽  
Sensing Performance ◽  
Good Agreement

In this paper, we studied the sensing performance of metasurfaces comprised by spiral-disk-shaped metallic elements patterned on polypropylene substrates, which exhibited localized surface plasmon resonances in the low-frequency region of the terahertz (THz) spectrum (0.2–0.5 THz). Optimal designs of spiral disks with C-shaped resonators placed near the disks were determined and fabricated. The experimentally measured transmittance spectra of the samples coated with very thin photoresistive layers (d ~ 10−4–10−3 λ) showed good agreement with the simulations. The resonance frequency shift Δf increases with increasing d, while saturating near d = 50 µm. The narrow-band magnetic dark modes excited on symmetrical spiral disks with a 90° C-resonator demonstrated very high figure of merit (FOM) values reaching 1670 (RIU·mm)−1 at 0.3 μm thick analyte. The hybrid high order resonances excited on asymmetrical densely packed spiral disks showed about two times larger FOM values (up to 2950 (RIU·mm)−1) compared to symmetrical distantly spaced spirals that resembled the best FOM results found in the literature for metasurfaces fabricated with a similar technique. The demonstrated high sensing performance of spiral disks is evaluated to be promising for bio-sensing applications in the THz range.

scholarly journals Narrow Absorption in ITO-Free Perovskite Solar Cells for Sensing Applications Analyzed through Electromagnetic Simulation

2019 ◽  
Vol 9 (22) ◽  
pp. 4850 ◽  
Author(s):  
Mahmoud H. Elshorbagy ◽  
Alexander Cuadrado ◽  
Javier Alda
Keyword(s):  
Surface Plasmon ◽  
Active Layer ◽  
Spectral Response ◽  
Index Of Refraction ◽  
Metallic Surface ◽  
Coupling Mechanism ◽  
Selective Absorption ◽  
Surface Plasmon Resonances ◽  
Sensing Applications ◽  
Plasmon Resonances

This work reports on a computational analysis of how a modified perovskite cell can work as a refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric interfaces are necessary to excite plasmonic resonances. However, if the transparent conductor (ITO) is replaced by a uniform metal layer, the optical absorption at the active layer decreases significantly. This absorption enhances again when the front metallic surface is nanostructured, adding a periodic extruded array of high aspect-ratio dielectric pyramids. This relief excites surface plasmon resonances through a grating coupling mechanism with the metal surface. Our design allows a selective absorption in the active layer of the cell with a spectral response narrower than 1 nm. The photo-current generated by the cells becomes the signal of the sensor. The device employs an opto-electronic interrogation method, instead of the well-known spectral acquisition scheme. The sensitivity and figure of merit (FOM) parameters applicable to refractometric sensors were adapted to this new situation. The design has been customized to sense variations in the index of refraction of air between 1.0 and 1.1. The FOM reaches a maximum value of 1005 RIU − 1 , which is competitive when considering some other advantages, as the easiness of the acquisition signal procedure and the total cost of the sensing system. All the geometrical and material parameters included in our design were selected considering the applicable fabrication constrains.

A five-band absorber based on graphene metamaterial for terahertz ultrasensing

2022 ◽  
Author(s):  
Weijie Jiang ◽  
Tao Chen
Keyword(s):  
Refractive Index ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Resonant Frequencies ◽  
Localized Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Thin Wires ◽  
Plasmon Resonances ◽  
Theoretical Results ◽  
Index Unit

Abstract We design and propose a five-band absorber based on graphene metamaterial for the terahertz (THz) sensing field. The localized surface plasmon resonances (LSPR) of patterned graphene are excited, contributing to five tunable ultra-narrow absorption peaks, which are specified by the electric field distributions. Moreover, the absorber is insensitive to different polarization modes and incident angles. When increasing the Fermi level of the patterned graphene, which is composed of a round ring and a square ring connected by four thin wires, the resonant frequencies exhibit distinct blue shifts. For refractive index sensing, due to the addition of a continuous dielectric groove, the theoretical results show that the maximum averaged normalized sensitivity, Q factor, and FOM can reach 0.647 RIU-1 (refractive index unit, RIU), 355.94, and 215.25 RIU-1, indicating that the sensing performances are further enhanced compared with previous works. As a result, the proposed structure may provide a new method to realize ultrasensing in the THz region.

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