Circular Polarization

An international team of physicists has found that it is possible to generate spin currents directly using certain kinds of ultrashort laser pulses. In their study, published in the journal Physical Review Letters, the group used a linearly polarized laser pulse and a circularly polarized probe laser to create the spin currents.

Device expands ways to manipulate low-dimensional quantum materials

A team of scientists from Columbia, Nanjing University, Princeton, and the University of Munster, writing in the journal Nature, have presented the first experimental evidence of collective excitations with spin called chiral graviton modes (CGMs) in a semiconducting material.

Observations from the Event Horizon Telescope show that the supermassive black hole at the heart of the galaxy M87 has twisted magnetic fields that help...

The magnetic field is a thousand times weaker than Earth's, but is spread out across 16,000 light years.

A new approach to quantum light emitters generates a stream of circularly polarized single photons, or particles of light, that may be useful for a range of quantum information and communication applications. A Los Alamos National Laboratory team stacked two different atomically thin materials to realize this chiral quantum light source.

The Bessel beam, with a significant depth of field and self-healing characteristics, has been applied in widespread applications, including quantum entanglement, underwater 3D imaging, optical micro-manipulation, microscope, and so on. However, these methods, such as circular slit and lens, axicon, spatial light modulator (SLM), are complicated due to the usage of bulky optical elements and hinder the Bessel beam…

A research group led by Dr. Jialei He of Nagoya University's Graduate School of Engineering has developed a method for processing cholesteric liquid crystals (CLCs) into micrometer-sized spherical particles.

New 900 MHz and 2.4 GHz RHCP Flat-Panel/Pad Antennas Bring Efficient RFID Tag Reading

The term meta means a concept of transcendence or surpassing, and when applied to materials, metamaterials encompass artificially engineered substances that exhibit properties not naturally found in the environment. Metasurfaces, characterized by their thinness and lightness, have garnered considerable interest as a potential component for incorporation into portable augmented reality (AR) and virtual reality (VR)…

Our experimental proof of chiral phonons demonstrates a degree of freedom in condensed matter that is of fundamental importance and opens the door to exploration of emergent phenomena based on chiral bosons.

Photoexcitation, and especially photoionization, is one of the most important manifestations of the light-matter interaction in nature, ranging from photosynthesis in plants and vision in biology to photography and laser processing of materials. It is generally accepted that the change in a substance is weaker the less light is absorbed. However, researchers found that this is not always the case.

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The Global Positioning System (GPS) uses accurate, stable atomic clocks in satellites and on the ground to provide world-wide position and time determination. These clocks have gravitational and motional frequency shifts which are so large that, without ...

A research group led by Prof. Wu Kaifeng from the Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences recently reported the successful initialization, coherent quantum-state control, and readout of spins at room temperature using solution-grown quantum dots, which represents an important advance in quantum information science.

Whispering-gallery-mode (WGM) cavities represent an intriguing platform for intensely enhancing light-matter interaction. It lays the foundations for ultra-low threshold lasers, ultra-sensitive sensing, nonlinear optics and quantum photonics. The conventional WGM cavity is composed of homogeneous materials with a constant refractive index both in the core and cladding. The light field is confined in the cavity…

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Inspired by the optical structure of bifocal compound eyes, the authors demonstrate a nanophotonic light-field camera with large depth of field. By using a spin-multiplexed bifocal metalens array and neural network-based reconstruction, they capture high-resolution images at centimeter to kilometer scale.

Inspired by the dual-focus visual system of a 500-million-year-old trilobite, researchers have created and tested a light field camera with the greatest depth of field ever demonstrated. Everything between 3 cm and 1.7 km from the lens stays sharp.

Using a technique to block certain wavelengths of light, researchers hope to discover many more hidden pulsars