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Winnik Molecular Photonics Fundamentals and Practi For all customers wi Accurate finite-difference time-domain simulations are used to design the active-layer photonic crystal so as to maximize the number of its absorption resonances over the broadband interval where microcrystalline silicon is weakly absorbing before lattice disorder augmented with fabrication-induced imperfections is applied to further boost performance.
Such a design strategy may find practical use for increasing the efficiency of thin-film silicon photovoltaics.
The excitation of plasmonic dark modes via a radiative channel is a phenomenon strongly hindered in the subwavelength regime. Recently, for achieving this purpose it has been proposed to exploit near-field interactions between radiating bright modes and lossless dark modes.
Photonics Group — Institute of Physics — Lodz University of Technology — study in Lodz
However, this approach unveils challenging difficulties related to the excitation of dark modes through the near-field coupling with a bright mode. On the basis of this study, a T-shaped nanoantenna trimer has been introduced as an elemental unit for the energy transfer between bright and dark modes in plasmonic nanostructures. Finally, we implemented an analytical perturbative model to further investigate the plasmonic hybridization of subwavelength systems.
The dielectric properties of a regular 2D array of Au nanowires are investigated using time-dependent density-functional theory employing a fully atomistic quantum description. Longitudinal modes produce a Drude-like peak in the infrared that is rather insensitive to geometrical parameters. The general character of this phenomenon is confirmed by its occurrence in Au nanoparticle arrays.
Addition of ligand species in the hot spot region can lead to the appearance of new resonances due to strong coupling between plasmonic and molecular modes, as exemplified in a proof-of-concept case. This shows the possibilities of atomistic quantum plasmonics effects and subwavelength control of electromagnetic field intensity in properly engineered nanogaps.
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The laser-induced generation of vapor bubbles around gold nanoparticles AuNPs is a promising diagnostic and therapeutic avenue for various pathologies. The physical mechanism that leads to their formation strongly depends on the time regime of the irradiation. While the plasmonic nanobubbles induced by nanosecond and picosecond laser pulses are known to be triggered by the energy that is absorbed in the nanoparticles and diffused in the medium thermo-mediated cavitation , we show that a different plasma-mediated mechanism occurs in the case of femtosecond pulses.
This result cannot be explained by the standard thermo-mediated cavitation process and, thus, reveals the onset of a new mechanism in the ultrafast regime. We further show that the discrepancy between the dimensions of bubbles generated from linearly and circularly polarized laser pulses can be explained using a simple model, revealing the polarization cavitation dependence as a clear signature of the plasma mechanism.
This paper presents in detail the transition between both cavitation regimes and provides insight into the precise control of the cavitation dynamics at the nanoscale. The increase in the rate of nonradiative transition processes in sensitizer due to efficient energy transfer to activator is realized from steady-state and dynamic luminescence studies.
Luminescence quenching due to cross relaxation is least significant up to 20 at. The quantum yield of the sample with maximum luminescence, i. Also, samples are readily redispersible in water and could be easily incorporated in polymer-based films that show strong green light emission under UV excitation.
Tunable/Reconfigurable Metasurfaces: Physics and Applications
We numerically demonstrate total absorption in graphene in the near-infrared and visible wavelength ranges by means of critical coupling with guided resonances of a photonic crystal slab. Optical fiber communication systems are now fulfilling the increased demand on communication links, especially with the proliferation of the Internet. This module tracks the evolution of these systems that are now so critical to our daily lives. Its high bandwidth capabilities and low attenuation characteristics make it ideal for gigabit transmission and beyond. In this module, you will be introduced to the building blocks that make up a fiber-optic communication system.
You will learn about the different types of fibers and their applications , light sources and detectors, couplers, splitters, wavelength-division multiplexers, and the state-of-the-art devices used in the latest high-bandwidth communication systems. Attention is also given to system performance criteria, such as power and rise-time budgets.
Before you work through this module, you should have completed Module 1.
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In addition, you should be able to manipulate and use algebraic formulas, deal with units, and use basic trigonometric functions, such as sine, cosine, and tangent. A basic understanding of wavelength, frequency, and the velocity of light is also assumed. Myler University of Central Florida Orlando, Florida Electronic and electro-optic devices are frequently used to display images obtained from the computer processing of data.
Images, or digital pictures, are generally two-dimensional data structures that convey spatial information to the viewer. Images are collected through various means, from digital cameras to laser radar scanning systems. Once stored in a computer, these images can be manipulated mathematically to accomplish many different objectives. The improvement of images for viewing or analysis and computer interpretation of image content are among those objectives. This module explains the terminology associated with images, how images are acquired and stored, and how images are displayed.
Recording and displaying truly three-dimensional images are only small parts of it. Holographic optical elements HOE can perform the functions of mirrors, lenses, gratings, or combinations of them, and they are used in myriad technical devices. Holographic interferometry measures microscopic displacement on the surface of an object and small changes in the index of refraction of transparent objects like plasma and heat waves.
Future photonic devices, such as electro-optical chips, will undoubtedly incorporate micro-lasers and HOEs for optical computations, free-space interconnects, and massive analog and digital memory systems.