The Mac
@TheMac
07 November, 06:40
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The Mac
@TheMac
07 November, 06:41
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:43
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:44
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:46
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:52
In response The Mac to his Publication
Metamaterials and Transformation Optics
Metamaterials may be classified into two categories: LSPR-based and non-LSPR metamaterials. LSPR-based metamaterials such as negative index metamaterials rely upon LSPR phenomenon and hence the best performing plasmonic materials are noble metals followed by metal nitrides, further followed by TCOs (Tassin et al., 2012). Non-LSPR metamaterials rely upon effective medium behavior of composite materials and examples are cloaks, hyperbolic metamaterials, and epsilon-near-zero (ENZ) materials. As a general note, most of the metamaterial implementations of transformation optics fall into the category of non-LSPR metamaterials. Such metamaterials benefit a lot from alternative plasmonic materials because of their smaller Im{εm}.
Metamaterials may be classified into two categories: LSPR-based and non-LSPR metamaterials. LSPR-based metamaterials such as negative index metamaterials rely upon LSPR phenomenon and hence the best performing plasmonic materials are noble metals followed by metal nitrides, further followed by TCOs (Tassin et al., 2012). Non-LSPR metamaterials rely upon effective medium behavior of composite materials and examples are cloaks, hyperbolic metamaterials, and epsilon-near-zero (ENZ) materials. As a general note, most of the metamaterial implementations of transformation optics fall into the category of non-LSPR metamaterials. Such metamaterials benefit a lot from alternative plasmonic materials because of their smaller Im{εm}.
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The Mac
@TheMac
07 November, 06:54
In response The Mac to his Publication
Hoffman et al. showed negative refraction at an operating wavelength of 8 µm in a so-called hyperbolic metamaterial consisting of planar, alternating layers (a superlattice) of heavily doped (1–4×1018 cm−3) In0.53Ga0.47As and undoped Al0.48In0.52As deposited by MBE (Hoffman et al., 2007). This metamaterial device was shown to have a performance figure-of-merit of about 20, the highest reported so far. Yet another demonstration is the epsilon-near-zero (ENZ) properties of the InAsSb material when doped heavily. Adams et al. show that heavy doping (1–2×1019 cm−3) of InAsSb causes the real permittivity to cross zero and turn metal-like in the MIR range (Adams et al., 2011). At the zero cross-over of real permittivity (occurring at about 8 µm wavelength), the material behaves as an ENZ material and exhibits special properties such as photon funneling.
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The Mac
@TheMac
07 November, 06:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:55
In response The Mac to his Publication
In the near-IR, Kim et al. showed ENZ property of TCO substrates pin the resonance of gold nanorods always to ENZ wavelength irrespective of their geometry (Kim et al., 2016). Naik et al. demonstrated highest performing hyperbolic metamaterial in the near-infrared using Al-doped ZnO and undoped ZnO alternating layers (Naik et al., 2012a). The figure-of-merit of this hyperbolic metamaterial was nearly 10 while similar noble-metal based structures have 3 orders of magnitude smaller figures-of-merit. The implication of this demonstration is that TCO-based metamaterials are best suited for applications such as hyperlens – a sub-diffraction imaging metamaterial device.
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The Mac
@TheMac
07 November, 06:57
In response The Mac to his Publication
In the visible spectral range, TiN based metamaterials have been demonstrated. In an example of a metamaterial for quantum optical applications, Naik et al. developed an epitaxial metal/dielectric superlattice based on TiN and AlN, and showed that the structure exhibits hyperbolic dispersion (Naik et al., 2014). Layer thickness down to 5 nm – not possible with noble metals – was possible in TiN based metamaterial only because the surface energy of TiN is nearly 3 orders of magnitude smaller than that of noble metals.
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The Mac
@TheMac
07 November, 07:00
In response The Mac to his Publication
Such a metamaterial showed a huge enhancement in local photonic density of states, and a fluorophore probe near such metamaterial experienced about 80x enhancement in its radiative decay rate. Such huge enhancement in photon emission rate is useful in many light emitting devices including a single photon source for quantum optical applications. Shalaginov et al. extended this work to demonstrate fast single photon emission from NV centers of nano-diamonds (Shalaginov et al., 2013).
Overall, alternative plasmonic materials are very promising for non-LSPR metamaterials owing to their smaller magnitude of real permittivity and small imaginary permittivity.
Overall, alternative plasmonic materials are very promising for non-LSPR metamaterials owing to their smaller magnitude of real permittivity and small imaginary permittivity.
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:02
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:02
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:09
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:12
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:17
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:17
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:23
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:23
In response The Mac to his Publication
Co-encapsulating solid lipid nanoparticles for multifunctional therapeutics: Preparation and characterization - ScienceDirect
One of the most favored features of using nanoparticulate delivery systems such as solid lipid nanoparticles (SLNs) is their capability to encapsulate…
https://www.sciencedirect.com/science/article/abs/pii/S0927775716306707Notice: Undefined index: tg1tga_access in /home/admin/www/anonup.com/themes/default/apps/timeline/post.phtml on line 396
The Mac
@TheMac
07 November, 07:24
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:26
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:26
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:27
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:27
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:28
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:28
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:30
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:31
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:34
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:35
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:35
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:36
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:36
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:38
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:39
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:41
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:45
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:46
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:48
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:50
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:51
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:51
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:53
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:53
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:05
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:06
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:06
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:10
In response The Mac to his Publication
Animation showing the radiation pattern of a phased array of 15 antenna elements spaced a quarter wavelength apart as the phase difference between adjacent antennas is swept between −120 and 120 degrees. The dark area is the beam or main lobe, while the light lines fanning out around it are sidelobes.
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The Mac
@TheMac
07 November, 08:12
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:13
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:15
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:15
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:16
In response The Mac to his Publication
You’ve been warned people.
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The Mac
@TheMac
07 November, 08:24
In response The Mac to his Publication
Researchers are developing new method of wireless deep brain stimulation. Two teams of scientists have developed new ways of stimulating neurons with nanoparticles, allowing them to activate brain cells remotely using light or magnetic fields.
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07 November, 12:00
In response The Mac to his Publication
5G coupled with the sun and magnetism of the earth ?
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The Mac
@TheMac
07 November, 02:53
In response Jason VanDerpoel to his Publication
The Sun's “loudest pitch” is about 0.0033 Hertz (Hz) — some 6,000 times below the lowest tone audible to a human ear.
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The Mac
@TheMac
07 November, 02:54
In response The Mac to his Publication
Om is the primordial sound of the universe
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The Mac
@TheMac
07 November, 02:55
In response The Mac to his Publication
In physics the term “ultrasound” applies to all acoustic energy with a frequency above human hearing (20,000 hertz or 20 kilohertz). Typical diagnostic sonographic scanners operate in the frequency range of 2 to 18 megahertz, hundreds of times greater than the limit of human hearing.
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The Mac
@TheMac
07 November, 02:58
In response The Mac to his Publication
Radio waves have the longest wavelengths in the electromagnetic spectrum. ... You can tune a radio to a specific wavelength—or frequency—and listen to your favorite music. The radio "receives" these electromagnetic radio waves and converts them to mechanical vibrations in the speaker to create the sound waves you can hear.
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