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 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 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.

Ultra-broadband visible and mid-infrared light absorber via magnetic dipole and surface plasmon resonances

Optik ◽  
2020 ◽  
Vol 220 ◽  
pp. 165142
Author(s):  
Tiesheng Wu ◽  
Xueyu Wang ◽  
Huixian Zhang ◽  
Weiping Cao ◽  
Yiying Wang ◽  
...  
Keyword(s):  
Magnetic Dipole ◽  
Surface Plasmon ◽  
Infrared Light ◽  
Surface Plasmon Resonances ◽  
Mid Infrared ◽  
Light Absorber ◽  
Plasmon Resonances

Field distribution and quality factor of surface plasmon resonances of metal meshes for mid-infrared sensing

Plasmonics ◽  
2013 ◽  
Vol 8 (2) ◽  
pp. 851-858 ◽  
Author(s):  
O. Limaj ◽  
M. Ortolani ◽  
V. Giliberti ◽  
A. Di Gaspare ◽  
F. Mattioli ◽  
...  
Keyword(s):  
Quality Factor ◽  
Field Distribution ◽  
Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Mid Infrared ◽  
Infrared Sensing ◽  
Plasmon Resonances ◽  
Metal Meshes

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.

Sign in / Sign up

Export Citation Format

Share Document