scholarly journals PLASMON MODES IN METAL NANOWIRES AND LEFT-HANDED MATERIALS

2002 ◽  
Vol 11 (01) ◽  
pp. 65-74 ◽  
Author(s):  
VIKTOR A. PODOLSKIY ◽  
ANDREY K. SARYCHEV ◽  
VLADIMIR M. SHALAEV
Keyword(s):  
Near Infrared ◽  
Incident Light ◽  
Field Enhancement ◽  
Dipole Approximation ◽  
Metal Nanowires ◽  
Light Wavelength ◽  
Local Field Enhancement ◽  
Left Handed ◽  
Incident Light Wavelength ◽  
Plasmon Modes

The electromagnetic field distribution for thin metal nanowires is found, by using the discrete dipole approximation. The plasmon polariton modes in wires are numerically simulated. These modes are found to be dependent on the incident light wavelength and direction of propagation. The existence of localized plasmon modes and strong local field enhancement in percolation nanowire composites is demonstrated. Novel left-handed materials in the near-infrared and visible are proposed based on nanowire composites.

scholarly journals Properties and Analysis of Transparency Conducting AZO Films by Using DC Power and RF Power Simultaneous Magnetron Sputtering

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Neng-Fu Shih ◽  
Jin-Zhou Chen ◽  
Yeu-Long Jiang
Keyword(s):  
Incident Light ◽  
Blue Shift ◽  
Light Wavelength ◽  
Rf Power ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Power ◽  
Incident Light Wavelength ◽  
Significant Blue Shift ◽  
Sputtering System

DC power and RF power were introduced into the magnetic controlled sputtering system simultaneously to deposit AZO films in order to get an acceptable deposition rate with high quality transparency conducting thin film. The resistivity decreases with the RF power for the as-deposited samples. The resistivity of 6 × 10−4 Ω-cm and 3.5–4.5 × 10−4 Ω-cm is obtained for the as-deposited sample, and for all annealed samples, respectively. The transmittance of the AZO films with higher substrate temperature is generally above 80% for the incident light wavelength within 400–800 nm. The transmittance of the as-deposited samples reveals a clear blue shift phenomenon. The AZO films present (002) oriented preference as can be seen from the X-ray diffraction curves. All AZO films reveal compressive stress. The annealing process improves the electrical property of AZO films. A significant blue shift phenomenon has been found, which may have a great application for electrode in solar cell.

scholarly journals Plasmon-Enhanced Photoresponse of Self-Powered Si Nanoholes Photodetector by Metal Nanowires

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2460
Author(s):  
Pericle Varasteanu ◽  
Antonio Radoi ◽  
Oana Tutunaru ◽  
Anton Ficai ◽  
Razvan Pascu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Simulation Analysis ◽  
Field Enhancement ◽  
Metal Nanowires ◽  
Local Surface Plasmon Resonance ◽  
Resonance Effects ◽  
Enhanced Sensitivity ◽  
Infrared Spectral ◽  
Self Powered ◽  
Cost Efficient

In this work, we report the development of self-powered photodetectors that integrate silicon nanoholes (SiNHs) and four different types of metal nanowires (AgNWs, AuNWs, NiNWs, PtNWs) applied on the SiNHs’ surface using the solution processing method. The effectiveness of the proposed architectures is evidenced through extensive experimental and simulation analysis. The AgNWs/SiNHs device showed the highest photo-to-dark current ratio of 2.1 × 10−4, responsivity of 30 mA/W and detectivity of 2 × 1011 Jones along with the lowest noise equivalent power (NEP) parameter of 2.4 × 10−12 WHz−1/2 in the blue light region. Compared to the bare SiNHs device, the AuNWs/SiNHs device had significantly enhanced responsivity up to 15 mA/W, especially in the red and near-infrared spectral region. Intensity-modulated photovoltage spectroscopy (IMVS) measurements revealed that the AgNWs/SiNHs device generated the longest charge carrier lifetime at 470 nm, whereas the AuNWs/SiNHs showed the slowest recombination rate at 627 nm. Furthermore, numerical simulation confirmed the local field enhancement effects at the MeNWs and SiNHs interface. The study demonstrates a cost-efficient and scalable strategy to combine the superior light harvesting properties of SiNHs with the plasmonic absorption of metallic nanowires (MeNWs) towards enhanced sensitivity and spectral-selective photodetection induced by the local surface plasmon resonance effects.

scholarly journals Numerical simulation of a plasmonic lens for laser light focusing

2021 ◽  
Vol 2103 (1) ◽  
pp. 012174
Author(s):  
E S Kozlova ◽  
V V Kotlyar
Keyword(s):  
Focal Spot ◽  
Laser Light ◽  
Incident Light ◽  
Lens Design ◽  
Light Wavelength ◽  
Optimal Parameters ◽  
Plasmonic Lens ◽  
Radial Polarization ◽  
Incident Light Wavelength ◽  
Difference Time

Abstract In this paper, the design of a plasmonic lens in gold and silver thin films for focusing the light with radial polarization is presented. Using the finite difference time domain method the optimal parameters of the plasmonic lens design are found. It was shown that the silver plasmonic lens produces a tight focal spot with a full width at half maximum of 0.38 of the incident light wavelength.

Light-triggered Silicon-carbon Pi'npin Devices for Optical Communications: Theoretical and Electrical Approaches

2010 ◽  
Vol 1245 ◽  
Author(s):  
Manuela Vieira ◽  
M. A. Vieira ◽  
João Costa ◽  
Paula Louro ◽  
Miguel Fernandes ◽  
...  
Keyword(s):  
Optical Communications ◽  
Incident Light ◽  
Optical Signal ◽  
Nonlinear Dependence ◽  
Light Wavelength ◽  
Electrical Model ◽  
Silicon Carbon ◽  
Light Generation ◽  
Incident Light Wavelength ◽  
Device Operation

AbstractIn this paper a light-activated multiplexer/demultiplexer silicon-carbon device is analysed. An electrical model for the device operation is presented and used to compare output signals with experimental data. An algorithm that takes into accounts the voltage and the optical bias controlled sensitivities is developed. The device is a double pi'n/pin a-SiC:H heterostructure with two optical gate connections for light triggering in different spectral regions. Multiple monochromatic pulsed communication channels were transmitted together, each one with a specific bit sequence. The combined optical signal was analyzed by reading out, under different applied voltages and optical bias, the generated photocurrent across the device. Experimental and simulated results show that the output multiplexed signal has a strong nonlinear dependence on the light absorption profile, i.e. on the incident light wavelength, bit rate and intensity under unbalanced light generation of carriers. By switching between positive and negative voltages the input channels can be recovered or removed from the output signal.

scholarly journals Design and Manufacturing of a Nd-Doped Phosphate Glass-Based Jewel

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2321
Author(s):  
Diego Pugliese ◽  
Federico Simone Gobber ◽  
Ilaria Forno ◽  
Daniel Milanese ◽  
Marco Actis Grande
Keyword(s):  
Mechanical Properties ◽  
Phosphate Glass ◽  
Industrial Design ◽  
Incident Light ◽  
Metal Alloy ◽  
Light Wavelength ◽  
Design And Manufacturing ◽  
Incident Light Wavelength ◽  
Selection Of

This paper reports the results of the designing, manufacturing and characterization of a jewel obtained by means of coupling the dogmas of industrial design to the analytical engineering approach. The key role in the design of the jewel was played by an in-house synthesized Neodymium (Nd)-doped phosphate glass, selected due to its easy handling and capability to change color according to the incident light wavelength. The glass core was covered by a metal alloy to mitigate its relatively high fragility and sensitivity to thermal shock and, at the same time, to highlight and preserve its beauty. The selection of the proper metal alloy, having thermo-mechanical properties compatible with those exhibited by the glass, was carried out by means of Ashby’s maps, a powerful tool commonly adopted in the field of industrial design.

Effect of Incident Light Wavelength and Corneal Edema on Light Scattering and Penetration: Laboratory Study of Human Corneas

2010 ◽  
Vol 26 (10) ◽  
pp. 786-795 ◽  
Author(s):  
Donald A. Peyrot ◽  
Florent Aptel ◽  
Caroline Crotti ◽  
Florent Deloison ◽  
Simon Lemaire ◽  
...  
Keyword(s):  
Light Scattering ◽  
Laboratory Study ◽  
Incident Light ◽  
Corneal Edema ◽  
Light Wavelength ◽  
Incident Light Wavelength

scholarly journals Electromagnetic enhancement of ordered silver nanorod arrays evaluated by discrete dipole approximation

2015 ◽  
Vol 6 ◽  
pp. 686-696 ◽  
Author(s):  
Guoke Wei ◽  
Jinliang Wang ◽  
Yu Chen
Keyword(s):  
Incident Angle ◽  
Incident Light ◽  
Field Enhancement ◽  
Dipole Approximation ◽  
Discrete Dipole Approximation ◽  
Exponential Dependence ◽  
Excitation Wavelength ◽  
Gap Size ◽  
Incident Plane ◽  
Improved Performance

The enhancement factor (EF) of surface-enhanced Raman scattering (SERS) from two-dimensional (2D) hexagonal silver nanorod (AgNR) arrays were investigated in terms of electromagnetic (EM) mechanism by using the discrete dipole approximation (DDA) method. The dependence of EF on several parameters, i.e., structure, length, excitation wavelength, incident angle and polarization, and gap size has been investigated. “Hotspots” were found distributed in the gaps between adjacent nanorods. Simulations of AgNR arrays of different lengths revealed that increasing the rod length from 374 to 937 nm (aspect ratio from 2.0 to 5.0) generated more “hotspots” but not necessarily increased EF under both 514 and 532 nm excitation. A narrow lateral gap (in the incident plane) was found to result in strong EF, while the dependence of EF on the diagonal gap (out of the incident plane) showed an oscillating behavior. The EF of the array was highly dependent on the angle and polarization of the incident light. The structure of AgNR and the excitation wavelength were also found to affect the EF. The EF of random arrays was stronger than that of an ordered one with the same average gap of 21 nm, which could be explained by the exponential dependence of EF on the lateral gap size. Our results also suggested that absorption rather than extinction or scattering could be a good indicator of EM enhancement. It is expected that the understanding of the dependence of local field enhancement on the structure of the nanoarrays and incident excitations will shine light on the optimal design of efficient SERS substrates and improved performance.

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