While living tissue significantly attenuates and scatters visible light, attenuation, and scattering are less for two spectral regions at slightly longer wavelengths. The first and second near-infrared (NIR) windows refer to these frequencies. Although labels emitting in the NIR-II band are challenging, this band is especially attractive. A group of scientists has created an organic [..]

The diagnosis of sepsis must be made quickly, but the tests presently used to do so can take up to 72 hours. Researchers have created an optical detector that can diagnose sepsis in minutes instead of several days. The portable biosensor uses digital plasmonic imaging, in which nanoparticles have improved. An optical metasurface made of [..]

A research team has created a low-cost colloidal quantum dot photodetector that can sense long-wave infrared (IR) light and may eventually replace more expensive commercially available options. According to the researchers, the new technology closes a gap in the photodetection spectrum and may be helpful for environmental monitoring, food inspection, and gas analysis. With silicon [..]

Non-line-of-sight imaging (NLoS), which is the task of recovering image data from objects hidden from direct observation or hidden by corners, can be approached in several ways, frequently requiring techniques to recover data from highly scattered or diffuse optical signals. In recent years, methods for reconstructing images using the intrinsic spatial correlations encoded in scattered [..]

 Researchers have created a method for turning a regular optical substance into a frequency doubler using light. The method could be used to investigate quantum-mechanical tunneling and build all-optical information processing devices. An optical phenomenon known as frequency doubling occurs in radially asymmetric materials with a second-order nonlinear susceptibility. One photon with a frequency twice [..]

To treat, identify, or keep track of GI disorders, a variety of medical devices can be inserted into the gastrointestinal system. Once they have completed their task, many of these must be removed through invasive surgery. Engineers have now devised a method to cause the internal decomposition of such devices when they are subjected to [..]

Particularly when it comes to a 3-D scanner in cutting-edge technology, faster is sometimes better. Researchers are working to create a 3-D lidar sensor that is portable and simple to use, with uses in autonomous vehicles, robots and drones, security systems, and more. In a field where speed is frequently valued above other factors, researchers [..]

Accurate identification and segmentation of choroidal neovascularization (CNV) are crucial for detecting and treating exudative age-related macular degeneration. (AMD). Cross-sectional and en-face imaging of CNV is possible with PR-OCTA or projection-resolved optical coherence tomographic i.e., OCT angiography. Due to the persistence of residual artifacts, CNV segmentation and detection remain challenging even with PR-OCT Angiography. In [..]

For accurate, real-time intraoperative diagnosis of brain tumors, researchers have merged an advanced optical imaging technique with an AI system. The accuracy of pathologist interpretation of traditional histologic images was compared to the diagnostic accuracy of brain tumor image categorization through machine learning. Both methods produced comparable findings, with the AI-based diagnosis being 94.6% accurate [..]

In real-time, scientists observed that helium nanodroplets respond ultrafast after being excited by XUV radiation (extreme ultraviolet radiation). Researchers now have new opportunities for thoroughly examining the basic characteristics of matter thanks to lasers that produce intense, brief XUV and X-ray bursts. Nanometer-sized material samples are of special interest in many of these experiments. Some [..]

Researchers have created a new imaging method that uses fewer images than conventional nanoscopy methods to generate nm-scale resolution. The researchers used ghost imaging to accelerate their method’s imaging performance. The novel method might be advantageous for live cell imaging. The approach is founded on stochastic optical reconstruction microscopy (STORM), a wide-field microscopy technique that [..]

Scientists have described a prototype atomic-array optical tweezer clock that combines the advantages of single-atom and optical-lattice clocks. The most precise and reliable optical clocks currently rely on the optical probing of either a single ion or a group of neutral atoms in an optical lattice. An array of about 40 strontium atoms, each one [..]

Using low-cost solution-processing techniques, a study team has created high-efficiency, near-infrared LEDs covering 900 mm2. Researchers point out that infrared LEDs are frequently used in remote controls and security video systems and have been used in optical communications and covert illumination. According to the researchers, they are typically small point sources, which restricts their use [..]

In mammalian brains, neuronal activity is frequently investigated at cellular and subcellular levels using two-photon laser scanning microscopy imaging. These investigations are still limited to a particular functional area of the brain. A novel method known as the multiarea two-photon real-time in vitro explorer ie, MATRIEX Imaging, was recently reported by researchers. The technique enabled [..]

Scientists have created a brand-new kind of optical metasurface that only allows light to reflect in one way. The researchers empirically proved nonreciprocal light reflection at wavelengths around 860 nm by utilizing an ultrathin nonlinear metasurface’s spatial and temporal phase manipulation. The novel metasurface may facilitate the creation of scalable, magnetic-free, nonreciprocal devices that can [..]

Infrared wavelengths, which have been challenging to produce with silicon chip technology, can now be converted into visible wavelengths thanks to the developing of a novel chip-integrated light source. This adaptable method of on-chip light production is set to make it possible to produce highly compact photonic instruments that are reliable enough to be used [..]

The majority of people find having an ultrasound to be a simple procedure: A technician applies gentle pressure to a probe against a patient’s skin, sending out sound waves that pass through the skin and bounce off muscle, fat, and other soft tissues before returning to the probe, which picks up the waves and interprets [..]

Skip the litmus paper; instead, a new type of pH sensor based on the current light developed by a global research team could provide users with an immediate visual readout and continuously capture a signal without interfering with the monitored biological systems. The scientists think their proof-of-concept gadget could inspire the creation of other sensors. [..]

Light can now experience multiple dimensions thanks to a novel optical chip design. It could support flexible systems for cutting-edge communications and super-fast artificial intelligence technologies. Considering that the area around us is only three-dimensional, it is mind-boggling to think that light can evolve in up to seven dimensions on our specially designed circuits. The [..]

Researchers are developing a deep learning-based pattern recognition, i.e., PR-OCT system, that will automate image processing and provide an accurate, computer-aided diagnosis of colorectal cancer potentially in real-time. The method uses deep learning and OCT machine learning to find patterns in healthy and abnormal tissue sample images. Using OCT as a study tool, the researchers [..]