Light Modulator

A team of researchers has described a method of designing metamolecules that incorporate two independently controllable subwavelength meta-atoms. This two-parametric control of the metamolecule secures the complete control of both amplitude and the phase of light – light modulator. A Korea Advanced Institute of Science and Technology (KAIST) research team in collaboration with the University [..]

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Coronavirus Diagnosis

Recognizing that current methods of Coronavirus diagnosis take approximately one hour, a team of researchers has developed a method that combines optics and magnetic particles able to test 100 samples of patients potentially infected with the virus and reduce the diagnostic time to approximately 15 minutes. The time it currently takes for Coronavirus diagnosis poses [..]

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Photonic Crystal

Researchers have seen light propagate in a special material without reflections. The material, a photonic crystal, consists of two parts that each have a slightly different pattern of perforations. Light can propagate along the boundary between these two parts in a special way: It is “topologically protected,” and therefore does not bounce back at imperfections. [..]

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High-Tech Contact Lenses

Researchers have incorporated ultra-thin optical devices known as metasurfaces into off-the-shelf high-tech contact lenses to correct deuteranomaly, a form of red-green color blindness. The new customizable contact lens could offer a convenient and comfortable way to help people who experience various forms of color blindness. This research can also improve the quality of plastic opthalmic [..]

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Photonics Technology

A recently released report from several German trade and research organizations argues that photonic technologies can represent “a driver of global sustainability,” and that the application of these technologies can prevent some 2.92 billion tons of annual CO2 emissions by 2030. Those avoided emissions, according to the study, would “correspond to at least 11% of [..]

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QCL

Lasers that switch on and off billions of times per second are the backbone of optical communications networks, but this feat is only possible at certain laser frequencies. A team of researchers has now taken a step towards extending this frequency range by using sound waves to modulate the emission of a terahertz (THz) quantum [..]

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Polarization Of Light

A team of physicists has found that a similarly asymmetrical pattern can be induced and measured at will in certain exotic materials, using a special kind of light beam (polarization of light) to stimulate the material. In this case, the phenomenon of “handedness,” known as chirality, occurs not in the structure of the molecules themselves, [..]

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OCT

An automated algorithm developed by the Universitat Politècnica de Valènci (UPV) proved capable of distinguishing between healthy and glaucomatous eyes with an accuracy of 0.81, sensitivity of 0.79 and specificity of 0.82, making use only of OCT volumes focused on the optic nerve head of the retina. Image analysis methods termed Class Activation Maps were [..]

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Ptychography Enables Lensless On-Chip Microscopy

Guoan Zheng, a University of Connecticut (UConn) professor of biomedical engineering, has published his findings on a successful demonstration of a lensless on-chip microscopy platform in Lab on a Chip. Zheng suggests his ptychography platform eliminates several of the most common problems with conventional optical microscopy while providing a low-cost option for the diagnosis of [..]

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Infrared Microscope

Researchers have added infrared (IR) capability to a standard optical microscope, with the goal of digital biopsy for cancer diagnosis. Pairing IR measurements with high-resolution optical images and machine learning algorithms, they created digital biopsies that closely correlated with traditional pathology techniques and also outperformed state-of-the-art infrared microscopes. The advantage is that no stains are [..]

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Hybrid Integrated Photonics

Big datacenters, Industry 4.0, and personalized healthcare—all these rapidly growing markets have one thing in common: they need miniaturized photonic components. Such miniaturized, or integrated, photonic components offer solutions for sensing, data transmission, and data processing. The technologies for manufacturing, alignment, and assembly of integrated photonic components are evolving. Often, the markets are small—and so [..]

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In conventional sensing methods, noise is always a problem, especially in systems that are meant to detect changes in their environment that are hardly bigger or even smaller than the noise in the system. Encountering this problem in his experiments with interacting photons, AMOLF physicist Said Rodriguez thought of a way around it. In an [..]

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For decades scientists have been trying to build computers that process information using light rather than electric currents. One of the biggest stumbling blocks has been finding a suitable nonlinear process to carry out the optical equivalent of a transistor’s switching. But now a U.S.–Canadian research collaboration believes it may have the answer—a specially-designed gel [..]

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Direct laser processing of material surfaces is a powerful technique for modifying the optical and electrical properties of those materials, often through the creation of nanostructures on the surface. The precise control of those surface modifications, and hence of the material’s modified properties, has remained challenging, largely due to the element of random chance that [..]

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Semiconductor quantum dots (QDs) that emit light in the near- and mid-infrared (IR) spectral ranges have the potential to power a range of optical devices. However, fundamental physical limitations decrease the intensity of IR-emitting QDs. At longer wavelengths, the quantum yield of such QDs decreases as the radiative emission rate drops following Fermi’s golden rule, [..]

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Using pseudo-random speckle patterns is an efficient way to image targets, but most approaches require bulky, expensive, complex and slow machinery. To apply this technique to biomedical imaging, such as ultra-thin endoscopy or in vivo neural imaging, a smaller device that can generate random speckles is needed. A team of researchers led by Takuo Tanemura [..]

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Researchers have demonstrated the use of stacked, transparent graphene photodetectors combined with image processing algorithms to produce 3-D images and range detection. Researchers at the University of Michigan have proven the viability of a 3-D camera that can provide high quality three-dimensional imaging while determining how far away objects are from the lens. This information [..]

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Sustained concentration (also known as a sustained state of vigilance) will generate a different type of memory than a momentary startle, and these differences are linked to distinct signaling molecules in the brains of mice. Researchers at the RIKEN Center for Brain Science (CBS) used optogenetics to help visualize these dynamics in the living mouse [..]

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While living tissue strongly absorbs and scatters visible light, there are two spectral regions at slightly longer wavelengths for which attenuation and scattering is lower. These two bands are called the first and second near-infrared (NIR) windows. The NIR-II band is particularly attractive, although labels that emit in this band are difficult to fabricate. A [..]

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Time is critical when diagnosing sepsis, but the tests currently used to identify this disease can take up to 72 hours. Researchers at the Laboratory of Bionanophotonic Systems (BIOS) at École Polytechnique Fédérale de Lausanne (EPFL) have developed an optical biosensor that reduces sepsis diagnosis time from several days to a few minutes. The portable [..]

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