scholarly journals Modelling 1-D Copper Grating for Extraordinary Optical Transmission

2021 ◽  
Author(s):  
Tahir Iqbal ◽  
Zain Ashfaq ◽  
Khalid Iqbal ◽  
Sumera Afsheen ◽  
Maria Zafar ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Near Infrared ◽  
Near Field ◽  
Extraordinary Optical Transmission ◽  
Field Analysis ◽  
Electromagnetic Spectrum ◽  
Transmission Spectra ◽  
Plasmonic Mode ◽  
Maximum Value ◽  
Plasmon Polaritons

Abstract The excitation of surface plasmon polaritons (SPPs) and its association with extraordinary optical transmission (EOT) has been presented in this report.. The 1-dimensional periodic grating structure of copper (Cu) has been designed over the glass substrate in rf-module of COMSOL Multiphysics 5.3a. The geometry was illuminated from glass side with visible-near infrared (400-900nm) electromagnetic spectrum. The 0th order transmission spectra have been investigated to study the maximum value of EOT at different slit widths by taking the period (700nm) and thickness of Cu grating (50nm) constant. Moreover, the near field analysis has been used to investigate the field behavior at desired interface and to verify the results of transmission spectra. It is worth mentioning that the highest value of EOT corresponds to the slit width of 250nm which is affiliated with the strongest plasmonic mode i.e., fundamental plasmonic mode. Such devices are increasingly applicable in sensing, chemical and solar cell industries.

scholarly journals Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip

Nanophotonics ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 269-276 ◽  
Author(s):  
Frederik Walla ◽  
Matthias M. Wiecha ◽  
Nicolas Mecklenbeck ◽  
Sabri Beldi ◽  
Fritz Keilmann ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Metal Film ◽  
Near Infrared ◽  
Near Field ◽  
Optical Microscope ◽  
Anisotropic Surface ◽  
Surface Wave Propagation ◽  
Rotationally Symmetric ◽  
Plasmon Polaritons

AbstractWe investigated the excitation of surface plasmon polaritons on gold films with the metallized probe tip of a scattering-type scanning near-field optical microscope (s-SNOM). The emission of the polaritons from the tip, illuminated by near-infrared laser radiation, was found to be anisotropic and not circularly symmetric as expected on the basis of literature data. We furthermore identified an additional excitation channel via light that was reflected off the tip and excited the plasmon polaritons at the edge of the metal film. Our results, while obtained for a non-rotationally-symmetric type of probe tip and thus specific for this situation, indicate that when an s-SNOM is employed for the investigation of plasmonic structures, the unintentional excitation of surface waves and anisotropic surface wave propagation must be considered in order to correctly interpret the signatures of plasmon polariton generation and propagation.

Extraordinary optical transmission from a thin microcavity by macroscopic quantum effect

2021 ◽  
Author(s):  
Lin Zhang ◽  
Jiu Hui Wu
Keyword(s):  
Edge Effect ◽  
Optical Transmission ◽  
Critical Radius ◽  
Quantum Effect ◽  
Near Field ◽  
Extraordinary Optical Transmission ◽  
Wave Regime ◽  
Incident Wavelength ◽  
Macroscopic Quantum ◽  
Wave Particle Duality

Abstract The macroscopic quantum effect is revealed to elaborate the extraordinary optical transmission (EOT) from a subwavelength thin microcavity based on the uncertainty property of the transmitted electromagnetic fields after the aperture. A critical radius is found in the thin microcavity under a certain incident electromagnetic wavelength. With the aperture radius varying, the transmitted field can be divided into three regimes: I. the macroscopic quantum regime when the aperture radius is less than the critical radius, in which the field edge effect occurs and EOT phenomenon is perfectly manifested; II. The wave-particle duality regime in the vicinity of the critical radius, in which the edge effect and diffraction phenomenon exist simultaneously; III. The wave regime when the aperture radius is greater than the critical radius, in which the near-field diffraction emerges. In addition, the influences of incident wavelength and microcavity thickness on EOT are also investigated. Our research have potential applications in advanced optical devices, such as light switch and optical manipulations.

Optical and electrical mappings of surface plasmon cavity modes

Nanophotonics ◽  
2014 ◽  
Vol 3 (1-2) ◽  
pp. 33-49 ◽  
Author(s):  
Fan Ye ◽  
Juan M. Merlo ◽  
Michael J. Burns ◽  
Michael J. Naughton
Keyword(s):  
Surface Plasmon ◽  
Optical Transmission ◽  
Near Field ◽  
Standing Waves ◽  
Wavelength Selection ◽  
Cavity Modes ◽  
Advanced Information Technology ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning ◽  
Plasmon Polaritons

AbstractPlasmonics is a rapidly expanding field, founded in physics but now with a growing number of applications in biology (biosensing), nanophotonics, photovoltaics, optical engineering and advanced information technology. Appearing as charge density oscillations along a metal surface, excited by electromagnetic radiation (e.g., light), plasmons can propagate as surface plasmon polaritons, or can be confined as standing waves along an appropriately-prepared surface. Here, we review the latter manifestation, both their origins and the manners in which they are detected, the latter dominated by near field scanning optical microscopy (NSOM/SNOM). We include discussion of the “plasmonic halo” effect recently observed by the authors, wherein cavity-confined plasmons are able to modulate optical transmission through step-gap nanostructures, yielding a novel form of color (wavelength) selection.

Extraordinary optical transmission in one-dimensional gold gratings: near- and far-field analysis

2011 ◽  
Vol 50 (22) ◽  
pp. 4529 ◽  
Author(s):  
F. Romanato ◽  
T. Ongarello ◽  
G. Zacco ◽  
D. Garoli ◽  
P. Zilio ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Extraordinary Optical Transmission ◽  
Field Analysis ◽  
Far Field ◽  
One Dimensional

scholarly journals Near-field characterization of extraordinary optical transmission in sub-wavelength aperture arrays

2007 ◽  
Vol 15 (15) ◽  
pp. 9129 ◽  
Author(s):  
Michael Mrejen ◽  
Abraham Israel ◽  
Hesham Taha ◽  
Mila Palchan ◽  
Aaron Lewis
Keyword(s):  
Optical Transmission ◽  
Near Field ◽  
Extraordinary Optical Transmission ◽  
Aperture Arrays ◽  
Sub Wavelength

scholarly journals Investigating the Fabrication Imperfections of Plasmonic Nanohole Arrays and Its Effect on the Optical Transmission Spectra

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Amr M. Mahros ◽  
Marwa M. Tharwat
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Optical Transmission ◽  
Fdtd Method ◽  
Extraordinary Optical Transmission ◽  
Gold Films ◽  
Transmission Spectra ◽  
Nanohole Arrays ◽  
Optical Transmission Spectra ◽  
Difference Time

We investigate the extraordinary optical transmission spectra of thin gold films perforated with imperfect nanohole arrays using the finite difference time domain (FDTD) method. Exponential shapes for the nanohole sidewalls are used. To the best of our knowledge, such investigation of transmission spectra of imperfect nanohole arrays has not previously been demonstrated. It was found that the asymmetry between the two openings of the circular nanoholes or bending to their sidewalls strongly modifies both the intensity and resonance positions of the transmission spectra. Furthermore, the results of this study assist in explaining the technicality of extraordinary optical transmission phenomenon and why some experimental results on transmission differ from those expected.

Extraordinary Optical Transmission Brightens Near-Field Fiber Probe

Nano Letters ◽  
2011 ◽  
Vol 11 (2) ◽  
pp. 355-360 ◽  
Author(s):  
Lars Neumann ◽  
Yuanjie Pang ◽  
Amel Houyou ◽  
Mathieu L. Juan ◽  
Reuven Gordon ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Near Field ◽  
Extraordinary Optical Transmission ◽  
Fiber Probe

scholarly journals A Theoretical Study of Broadband Extraordinary Optical Transmission in Gold Plasmonic Square Nanohole Arrays and its Application on Refractive Index Sensor

2021 ◽  
Author(s):  
Rehan Shafiq ◽  
Javed Iqbal ◽  
Adnan Daud Khan ◽  
Anees Ur Rehman
Keyword(s):  
Refractive Index ◽  
Optical Transmission ◽  
Near Infrared ◽  
Contrast Ratio ◽  
Extraordinary Optical Transmission ◽  
Index Of Refraction ◽  
Practical Significance ◽  
Localized Surface Plasmon ◽  
Refractive Index Sensor ◽  
Plasmonic Sensor

Abstract Extraordinary optical transmission (EOT) behaviour is investigated in a subwavelength plasmonic nanostructure, consisting of a gold film perforated with a square nanohole array and deposited on a silicon dioxide substrate. The essential aspect of the proposed structure is the periodic disorder that enables broadband transmission peaks in the visible and near-infrared region and reduces the structure's size, which mainly arises from the excitation of localized surface plasmon resonances (LSPRs). Optical cavity modes formed in the nanoholes and the hybridization of plasmon modes. Further, the performance of the proposed nanostructure as a plasmonic sensor is analyzed by increasing the index of refraction of the local environment; the EOT exhibit remarkable refractive index sensitivity of up to 944 nm/RIU, a figure of merit of 9.25 and a contrast ratio of 47% are realized. The proposed structure has some practical significance for designing low-cost and effective sensing devices.

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