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UrduElectromagnetic waves with vortex-shape, namely vortex beams, are important in various fields. However, multi-mode OAM beams are rarely seen. To solve this, the researchers in China propose a metasurface design scheme that generates double-polarized vortex combs in the terahertz band, with flexible control of the mode numbers, positions, and intervals.
Tag: Electromagnetic Waves
NUS researchers develop new aerogels for radiative cooling and the absorption of electromagnetic waves
Scientists from the National University of Singapore have developed innovative aerogels for radiative cooling and electromagnetic waves absorption. Using plastic waste, the team engineered thin-film aerogels that function as thermal insulators and radiative coolers. These aerogels can be applied to the roofs of buildings to reduce indoor temperatures.
Electromagnetic wave absorbers with strong absorption and broad effective bandwidth!
Dr. Hee Jung Lee’s research team from the Department of Functional Composites in Composites Research Division at Korea Institute of Materials Science(KIMS) has successfully developed electromagnetic wave absorbers based on metal-organic frameworks (MOFs) that enhance dielectric and magnetic losses in the gigahertz (GHz) frequency band.
Tunable VO2 Cavity Enables Multispectral Manipulation from Visible to Microwave Frequencies
Optical materials capable of dynamically manipulating electromagnetic waves are an emerging field in optics. However, the multispectral manipulation based on these materials is challenging due to their ubiquitous wavelength dependence. Scientist in China and Singapore cascaded VO2-based tunable optical cavities with selective-transparent layers, realizing the multispectral manipulation with reversible tunability covering wavelengths ranging from the visible to microwave regions. This work will provide a critical approach for expanding the multispectral manipulation ability of optical systems.
IceCube Observatory Creates First Map of Milky Way Without Using Electromagnetic Waves
We’ve learned a lot about the Universe from telescopes that are sensitive to anything from high-energy gamma waves to visible light to low-energy radio waves. But detecting such electromagnetic waves has limitations.
Accelerating waves shed light on major problems in physics
Researchers derive new wave equation that sheds light on fundamental physics questions.
Playing all the angles: A high-contrast grating structure for direction-tunable lasing
Lasers find applications across several fields ranging from telecommunications and remote sensing to medicine.