China
Africa
Explore chapters and articles related to this topic
Magneto-plasmonics in Purely Ferromagnetic Sub wavelength Arrays
Published in Klaus D. Sattler, st Century Nanoscience – A Handbook, 2020
S. D. Pappas, E. Th. Papaioannou
Plasmonics is a subfield of nanophotonics that deals with the light-matter interaction at metal/dielectric interfaces (Barnes, Dereux, & Ebbesen, 2003; Maier, 2007; Raether, 1988). Systematic investigations of surface plasmons (SPs) started in the early 1970s (Economou, 1969), and the field has experienced a renaissance during the last 20 years, arising from the progress in nanofabrication of particles and nanopatterning of surfaces (Baryakhtar, Demi-denko, & Lozovski, 2013; Ctistis, Patoka, Wang, Kempa, & Giersig, 2007; Ebbesen, Lezec, Ghaemi, Thio, & Wolff, 1998). The ground-breaking progress in understanding the underlying physics has opened up the road for utilization of new types of applications, ranging from sensing (Anker et al., 2008; Homola, 2008) to microscopy and telecommunications (Gjonaj et al., 2011; Pendry, 2000; van Oosten, Spasenovic, & Kuipers, 2010).
Medical Nanoscale Spectroscopy: Concepts, Principles, and Applications
Published in Sarhan M. Musa, Nanoscale Spectroscopy with Applications, 2018
Nanoscale spectrometry is a specific new technique in nanoscience. It is widely mentioned in nanophotonics, the new branch of nanoscience. Indeed, nanophotonics is the study of photon or light, which is on the nanoscale. Nanophotonics is an advanced optical science that makes use of optical engineering. The main focus is on optics and interaction between light or photon and objects at nanolevel. In general, nanophotonics can be useful in both basic and applied issues. Focusing on the basic issues, the main themes are fundamentals and principles of light and its interaction with objects at nanoscale. Considering the applied issues, the new nanode-vices that deal with opticals is the main focus. The novel nanoengineering can play a role in studying and developing such new nanooptical tools. Indeed, there are many new nanodevices that are good examples of applied nanophotonics tools.
Finite-Difference Time-Domain Method Application in Nanomedicine
Published in Sarhan M. Musa, Computational Nanotechnology Using Finite Difference Time Domain, 2017
The FDTD method can be useful in several branches of science. Indeed, electromagnetic waves are all around us, and they are usually studied in several ways. In general, as already mentioned, visible light is a kind of well-known electromagnetic wave. The electromagnetic wave is an example of a nano-level phenomenon. The wavelength is commonly presented in nanometer level. So the application of nanoscience to deal with electromagnetic waves is feasible. The nanoscale electromagnetic wave is a simple thing in the scientific world. Dealing with electromagnetic waves with a nanotechnology approach is a specific new nanoscience focus. As noted, nanophotonics, the new branch of nanoscience, is leading the way in this endeavor. In fact, nanophotonics is the study of photons of light; hence, it is the study of an actual nanoscale thing. In the past, nanophotonics was an advanced approach relating to optical science and engineering. But it can be extended to the medical field as already mentioned. This means nanophotonics poses both basic and applied usefulness. The fundamental nature and principles of the electromagnetic photon and its interaction with objects at the nanoscale is the main issue. Considering the applied issues, the development of new nanodevices is the main concern. Studying and developing new tools by nanoengineering is the first step, and their use in medical science can be an on-top process. Indeed, many new medical nanodevices are good examples of applied medical nanophotonics tools, such as medical nanospectrometry.
Synthesis of achiral rod-shaped triazolic molecules and investigation of their striped texture and propeller-patterned nematic droplets
Published in Liquid Crystals, 2023
Souria Benallou, Salima Saïdi-Besbes, Abdelatif Bouyacoub, Eric Grelet
Liquid crystals (LCs) are ubiquitous in our daily lives, found in a wide range of technological applications including display, optics, light-emitting diodes, photovoltaics, nanophotonics and biosensors [1,2]. These outstanding states of matter, which combine orientational and positional orders, continue to arouse the interest of the scientific community due to their potential for strategic applications. Numerous self-assembling systems built-up from functional organic molecules have been synthetised and investigated for their LC properties. The nature and stability of the resulting mesophases are closely dependent on the extent of intermolecular interactions and can be tuned and controlled through a suitable design of the molecular architecture and shape.
Single-ion, transportable optical atomic clocks
Published in Journal of Modern Optics, 2018
Marion Delehaye, Clément Lacroûte
Finally, further reduction of the system size could stem from the integration of optical elements to the trap itself. Several demonstrations of such systems have been made in the fields of QIP and cQED (cavity Quantum Electro-Dynamics): among other examples, an optical fiber directly integrated to a surface electrode trap or to an endcap trap allows efficient fluorescence light collection [147] and characterization of non-classical light fields by the ion [148]; a transparent SE trap with indium tin oxide (ITO) electrodes allows direct fluorescence light detection by a photodetector placed behind the trap [149]; integration of nanophotonics waveguides and grating couplers below a SE trap allows single-ion addressing from the chip [150].
A multiple-scattering polaritonic-operator method for hybrid arrays of metal nanoparticles and quantum emitters
Published in Journal of Modern Optics, 2018
Georgios D. Chatzidakis, Vassilios Yannopapas
Surface plasmons (SPs) are electromagnetic (EM) waves coupled to the collective charge oscillations at an interface between two media with permittivities of opposite sign, typically a dielectric or air and a metal. Localized SPs, also called particle plasmons, are plasma oscillations occurring at the surface of a finite metallic object of nanometer scale dimensions, i.e. a nanosphere or a nanorod. One of the most important features of metallic nanostructures supporting SPs is their ability to restrict light in subwavelength volumes, i.e. regions in space that are much smaller than the wavelength, a feature which makes them as ideal components in miniaturized photonic circuitry. The strong localization of the EM field within subwavelength volumes results in enormous values of the electric field and strong modification of the spontaneous emission, boosting the interaction of light with quantum systems near plasmonic nanostructures and leading to significantly modified (mainly enhanced) optical phenomena at the nanoscale. Some of the effects that have been studied in this research area are Fano effects in energy absorption [1–4], ultrafast switching and controlled population transfer [5–12], gain without inversion [13–16], quantum-coherence-enhanced surface plasmon amplification [17], controlled optical bistability and multistability [18–20], strongly modified four-wave mixing [21–24], enhanced second-harmonic generation [25,26] and nonlinear optical rectification [27], single [28] and double [29] optical transparency accompanied by slow light, phase control of absorption and dispersion [30], strongly enhanced Kerr nonlinearity [31–34], and controlled Goos-Hänchen shift [35]. These phenomena have various potential applications in nanophotonics and quantum nanotechnology, such as in ultra-sensitive sensing, in quantum information processing, in ultra-fast switching, to name a few.