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Topic Review
Micro-Raman Spectroscopy for Graphene Characterization
There has been growing interest in combining the unique properties of graphene-based materials with silver nanostructures, aiming for their utilization in the fields of plasmonics and metamaterials applications. Silver nanoparticles and nanostructures, with localized surface plasmonic resonance spanning from the visible to the near-infrared range, find utility in various applications, particularly in surface-enhanced Raman scattering (SERS). Materials based on graphene, for instance, graphene oxide (GO) and reduced graphene oxide (RGO), have demonstrated their potential as SERS substrates by generating strong chemical enhancement.
  • 252
  • 16 Oct 2023
Topic Review
Micro-Imaging Dust Analysis System
The Micro-Imaging Dust Analysis System (MIDAS) is one of several instruments on the European Space Agency's Rosetta mission which studied in-situ the environment around the active comet 67P/Churyumov–Gerasimenko as it flew into the inner Solar System. MIDAS is an atomic force microscope (AFM) designed to collect dust particles emitted from the comet, and then scan them with a very sharp needle-like tip to determine their 3D structure, size and texture with very high resolution (4 nanometers).
  • 242
  • 20 Oct 2022
Biography
Michael Green (Physicist)
Michael Boris Green FRS[1] (born 22 May 1946) is a British physicist and one of the pioneers of string theory. Currently a Professor of Theoretical Physics in the School of Physics and Astronomy at Queen Mary University of London, and emeritus professor in the Department of Applied Mathematics and Theoretical Physics and a Fellow in Clare Hall, Cambridge in England, he was Lucasian Professor of
  • 1.1K
  • 04 Jan 2023
Topic Review
Metric Units
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. The most widely used examples are the units of the International System of Units (SI). By extension they include units of electromagnetism from the CGS and SI units systems, and other units for which use of SI prefixes has become the norm. Other unit systems using metric units include: International System of Electrical and Magnetic Units, Metre–tonne–second (MTS) system of units, MKS system of units.
  • 428
  • 17 Oct 2022
Topic Review
Methods for Improving Thermal Fatigue Resistance of Copper
Thermal fatigue is the fatigue failure phenomenon caused by the thermal stress (or thermal strain) cycle caused by the temperature gradient cycle. 
  • 357
  • 11 May 2023
Topic Review
Metasurfaces for Sensing Applications
Photonic devices (sensors, in particular) require that an efficient dynamic control of light at nanoscale through field (electric or optical) variation using substitute low-loss materials. One such option may be plasmonic metasurfaces. Metasurfaces are arrays of optical antenna-like anisotropic structures (sub-wavelength size), which are designated to control the amplitude and phase of reflected, scattered and transmitted components of incident light radiation.
  • 703
  • 11 Oct 2022
Topic Review
Metasurface Photodetectors
Photodetectors are the essential building blocks of a wide range of optical systems. Typical photodetectors only convert the intensity of light electrical output signals, leaving other electromagnetic parameters, such as the frequencies, phases, and polarization states unresolved. 
  • 518
  • 26 Jan 2022
Topic Review
Metastable Inner-Shell Molecular State
Metastable Innershell Molecular State (MIMS) is a class of ultra-high-energy short-lived molecules have the binding energy up to 1,000 times larger and bond length up to 100 times smaller than typical molecules. MIMS is formed by inner-shell electrons that are normally resistant to molecular formation. However, in stellar conditions, the inner-shell electrons become reactive to form molecular structures (MIMS) from combinations of all elements in the periodic table. MIMS upon dissociation can emit x-ray photons with energies up to 100 keV at extremely high conversion efficiencies from compression energy to photon energy. MIMS is predicted to exist and dominate radiation processes in extreme astrophysical environments, such as large planet cores, star interiors, and black hole and neutron star surroundings. There, MIMS is predicted to enable highly energy-efficient transformation of the stellar compression energy into the radiation energy. The right schematic illustration shows the proposed four stages of the K-shell MIMS (K-MIMS) formation and x-ray generation process. Stage I: Individual atoms are subjected to the stellar compression and ready for absorbing the compression energy. Stage II: The outer electron shells fuse together under increasing "stellar" pressure. Stage III: At the peak pressure, via pressure ionization K-shell orbits form the K-MIMS, which is vibrationally hot and encapsulated by a Rydberg-like pseudo-L-Shell structure. Stage IV: The K-MIMS cools down by ionizing ("boiling-off") a number of pseudo-L-shell electrons and subsequent optical decay by emitting an x-ray photon. The dissociated atoms return their original atoms states and are ready for absorbing the compression energy. MIMS also can be readily produced in laboratory and industrial environments, such as hypervelocity particle impact, laser fusion and z-machine. MIMS can be exploited for highly energy-efficient production of high intensity x-ray beams for a wide range of innovative applications, such as photolithography, x-ray lasers, and inertial fusion.
  • 638
  • 18 Oct 2022
Topic Review
Metamaterials for Acoustic Noise Filtering and Energy Harvesting
The twenty-first century’s vision for Factory 4.0 requires more advanced methods for noise filtering while creating much safer and healthier environment. From various perspectives of physics, noise filtering capabilities could be addressed in multiple ways. The physics of noise control is first dissected into active and passive control mechanisms. Further different physics are categorized into different geunere to visualize their respective physics, mechanism, and target of their respective applications. Beyond traditional passive approaches, the comparatively modern concept for sound isolation and acoustic noise filtering is based on artificial metamaterials. These new materials demonstrate unique interaction with acoustic wave propagation exploiting different physics. A few multi-functional metamaterials were reported to harvest energy while filtering the ambient noise simultaneously. It was found to be extremely useful for next-generation noise applications where simultaneously, green energy could be generated from the energy which is otherwise lost. 
  • 364
  • 10 Jul 2023
Topic Review
Mesoscale Dielectric Particles: Unusual Optical Effects
Mesoscale dielectric particles are mesostructures comprising both wavelength-scaled (i.e. dimensions comparable to wavelength) particles and particle chains or arrays. These particles are made of low loss dielectric materials having relatively low refractive index, namely the refractive index less than two. The main unusual optical effects in such structures are discussed below.
  • 535
  • 01 Jan 2022
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