Transfer Printing – Integrating Chip-Based Optical Systems

Researchers have developed a pick and place integration process, generally referred to as transfer printing, for thin-film devices to allow local hybrid materials integration on host PICs. The method provides the freedom to carry out multiple printing processes on a single chip. The method relies on transferring membrane devices or coupons of material with dimensions [..]

Read More
Circulating Tumor Cells Count To Study Cancer

Tumors within an organ release cells into the circulation as they grow. These cells can spread to other organs, causing metastases or new tumors. Engineers have now discovered a technology that allows them to assess the rate of development of these circulating tumor cells (CTCs) in mice for the first time. Their method, which also [..]

Read More
Time And Temperature Sensitive Optical Sensors

A research team has created colloidal crystals sensitive to time and temperature that look like opal nanostructures and can make new sensors. These sensors record the temperature in their environment visibly and continuously over a set period. As a result, they’re ideal for continuous monitoring of temperature-sensitive processes. Exposure to only moderate temperatures for long [..]

Read More
Vein Visualization From Color Images For Medical Applications

Effective vein visualization is vital for several clinical procedures, such as venous blood sampling and intravenous injection. Existing technologies using infrared devices or ultrasound technology are not suitable for daily medical care due to their equipment. Now, researchers have devised a new regression-based vein visualization method. It uses conventional RGB images to assist in venipuncture [..]

Read More
IR Detector - Dual-Band, CMOS-Compatible, Bias-Tunable

Scientists have created an IR detector with two separate IR bands and a bias-switchable spectral response. On reversing the detector’s bias voltage, the gadget changes from the near-infrared (NIR) to the shortwave infrared (SWIR) band. It is possible to integrate the silicon-based dual-band photodetector into existing camera circuits and cellphones. A thin layer of Si [..]

Read More
Galaxy Evolution – Spectroscopy For Space Applications

In the mid-2020s, NASA will launch the Nancy Grace Roman Space Telescope. It will provide a panoramic field of view at least a hundred times larger than Hubble’s, at a similar resolution. It will survey the sky up to thousands of times faster than can be done with Hubble. This wide-field, high-resolution, and efficient survey [..]

Read More
2D Semiconductors For Optoelectronics

A new family of 2D semiconductors could pave the way for high-performance and energy-efficient electronics. The findings may lead to the fabrication of semiconductor devices applicable in mainstream electronics and optoelectronics – and even potentially replace silicon-based device technology altogether. 2D semiconductors are materials with a thickness of a few atoms. Due to their nanoscale [..]

Read More
COVID Test – Microscopy, AI Improve Accuracy

Researchers have paired microscopy with artificial intelligence to develop a fast, accurate, and cost-effective COVID test. While many methods currently exist to test for SARS-CoV-2, none use a label-free optical approach. So, the research team turned to a technique typically reserved for visualizing cells: spatial light image microscopy (SLIM), which facilitates chemical-free (or label-free) imaging. [..]

Read More
DNA Computing With Microfluidic Chips

DNA computing uses the individual units of DNA’s two strands (which are selectively bound to each other in a complementary manner) to do complicated mathematical calculations. However, most DNA computing processes are still manual – one needs to add reactants step-by-step to the reaction. Finally, scientists have developed a programmable DNA-based microfluidic device that a [..]

Read More
One-Photon Confocal Fluorescence Imaging

Due to light dispersion and absorption, imaging deep into tissues is challenging. The wavelength windows for high-resolution deep mouse brain imaging are around 1300 nm and 1700 nm. However, due to the low detection efficiency of currently available detectors, one-photon fluorescence imaging in the wavelength region has proved extremely difficult. Researchers have created one-photon confocal [..]

Read More
Reflective Displays Using Thin Films

Active display illumination technology generates a surplus of energy demand. Reflective displays (using thin films) that do not require active illumination can stifle this demand. However, these display technologies are challenging to employ in low-light conditions due to a lack of active light sources. The reflection of optical rays within a polymer-embedded microsphere introduces reflective [..]

Read More
Photopyroelectric Detectors - Chalcogenide Nanogratings

Photopyroelectric detectors can absorb electromagnetic radiation, convert the absorbed energy into thermal energy, and generate a pyroelectric voltage (PEV) across a pyroelectric material. Their applications include energy harvesting, infrared sensing, and thermal imaging. Conventional narrowband photopyroelectric detectors require a bulky bandpass filter. Alternatively, a narrowband filter, such as a photonic crystal, can be directly integrated [..]

Read More
Imaging Strategy - Single Spine Structural Plasticity

Researchers have developed a new imaging strategy that allows them to see the small, ultrastructural changes in dendritic spines during structural plasticity. They have captured the best of both imaging modalities by refining and elaborating on an established imaging technique called correlative light and electron microscopy (CLEM). Using 2-photon optical microscopy and glutamate uncaging, the [..]

Read More
Gravitational Lensing – Viewing Distant Black Holes

Astronomers have recorded an unparalleled look at X-rays from a black hole system in the early cosmos using gravitational lensing, a natural lens in space. For the first time, NASA’s Chandra X-ray Observatory employed this magnifying glass to sharpen X-ray images. It acquired details about black holes that would otherwise be too far away to [..]

Read More
Nanocomposite Improves Liquid Crystal Lens Response

Researchers have significantly improved the response time of a 4 mm-aperture hole-patterned liquid crystal (HLC) lens with doping of N-benzyl-2-methyl-4-nitroaniline (BNA) and rutile titanium dioxide nanoparticle (TiO2 NP) nanocomposite. The proposed HLC lens provides the focus and defocus times (related to the wavefront bending speed) that are 8.5× and 14× faster than the pristine HLC [..]

Read More
Graphene Quantum Dots For Optoelectronic Applications

Due to their lower toxicity than cadmium-based semiconductor quantum dots, graphene quantum dots (GQDs) are attractive luminous materials for numerous light-emitting, biological, and energy applications. The luminous properties of GQDs drive their practical applications sand uses. As a result, controlling and tailoring the emission properties of these materials to suit the specified optoelectronic applications is [..]

Read More
Silicon Carbide – New Platform For Integrated Photonics

Silicon Carbide (SiC) is a CMOS-compatible semiconductor material that holds promise for realizing the monolithic integration of electronics and photonics with low fabrication costs via CMOS foundry. The non-centrosymmetric crystal structures of SiC grant both second-order and third-order nonlinear effects, enabling an efficient light frequency conversion and on-chip generation of nonclassical light states. SiC exhibits [..]

Read More