To demonstrate the performance of the cloak in the visible range, we first characterized the calcite cloak in air using a green laser at wavelength of 532 nm (Fig. 3a, left). Even without a metal film covering the bottom surface of the cloak, light experiences total internal reflection for...
visible light photonic integrated Brillouin laser, with emission at 674 nm, a 14.7 mW optical threshold, corresponding to a threshold density of 4.92 mW μm−2, and a 269 Hz linewidth. Significant advances in visible light silicon nitride/silica all-waveguide resonators are achieved...
However, because the phase modulation depends on the light propagation inside the material, the thickness of phase holograms usually remains comparable to the wavelength. Here we experimentally demonstrate ultra-thin metasurface holograms that operate in the visible range whose thickness is only 30nm (...
Figure 1. Overview of visible light localization and paper organization. 2. Background on Visible Light Communication In the electromagnetic spectrum, the range in which the rays are perceptible to human eyes (between 400 and 800 THz or 375–780 nm) is generally considered as the visible light...
(UV) or visible radiation is absorbed by a molecule when the frequency of light is at correct energy to cause the electrons of the molecule torearrange(or become excited) to another higher-energy state of the system. Frequency,ν(measured inσ−1), wavelength,λ(usually measured in nm),...
Fe2WO6 nanocrystal with an average size of ~300nm was prepared by solid-state reaction between Fe2O3 and \{WO3\} at 950°C. The coupled structure of Fe2WO6/TiO2 was then fabricated by covering the Fe2WO6 surface with polycrystalline TiO2 by sol–gel process. Under visible-light irradiati...
One of the biggest challenges in tissue engineering and regenerative medicine is to ensure oxygen supply of cells in the (temporary) absence of vasculature. With the vision to exploit photosynthetic oxygen production by microalgae, co-cultivated in close
In terms of chemistry, the Ru(II) in the precursor solution is excited and S2O82−is simultaneously decomposed to sulfate anions and radicals on exposure to visible-light irradiation (~452 nm) (Fig.1and Supplementary Fig.1)25. The generated radicals can initiate monomer polymerization. The...
摘要: Visible light communication (VLC) is a kind of optical communication using visible wavelength of the electromagnetic spectrum from 380 to 780nm.关键词: VLC (Visible Light Communication LED (Light Emitting Diode WDM (Wavelength Division Multiplexing ...
The absorption peak at 553 nm of RhB dye is used to investigate the photocatalytic degradation activity. The change of C/C0 ratio is applied to follow the photodegradation, which is on behalf of the concentration ratio before and after photodegradation. As shown in Fig. 4a, it can be ...