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 [..]

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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 [..]

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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 [..]

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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 [..]

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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 [..]

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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 [..]

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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 [..]

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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 [..]

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Quantum Simulation – Tunable Mixed-Optomechanics

Cavity optomechanics has recently gained a lot of interest from the quantum physics, quantum optics, and quantum information sciences sectors. This is due to the importance of cavity optomechanics in both the study of fundamental quantum mechanics problems and quantum precision measurements. Quantum simulation, as a cutting-edge approach, could be a valuable tool for investigating [..]

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Photocatalysts - Metal Laminations Improve Performance

Using ‘core@shell’ nanocrystals with atomically conformal metal laminations, researchers have created a method that greatly increases the performance of plasmonic photocatalysts. Core@shells Nanocrystals with a core surrounded by a shell can take use of the interfacial synergy between the core and shell equivalents, making them useful in catalysis, electronics, and displays. The surface of the [..]

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Breathalyzers – Optical Sensor Integrated Into Smartphone Screen

Researchers have developed inexpensive breathalyzers integrated into the screens of smartphones or wearables. The new technology uses the evaporation rate of the fog produced by the breath on the phone screen, which increases with increasing breath alcohol content. The breathalyzers use a photodiode placed on the side of the screen to measure the signature of [..]

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Scanning Electron Microscopy Gets AI Boost

A team of researchers has applied deep learning to scanning electron microscopy to develop a super-resolution imaging technique. It can convert a low-resolution microstructure image into a super-resolution image. In modern-day materials research, scanning electron microscopy images play a crucial role in developing new materials, from microstructure visualization and characterization to numerical material behavior analysis. [..]

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Artificial Skin With Flexible Photonics

With the introduction of flexible materials, photonics can furnish numerous intriguing opportunities for both fundamental and applied research, enabling a plethora of applications beyond the capabilities of its electronic counterpart. It is non-invasive, ultrasensitive to external stimuli, and immune to electromagnetic interference of photons as signal carriers. Photonic devices have demonstrated exceptional optical modulation and [..]

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Voice Biometrics To Prevent Frauds

Voice biometrics are a powerful and convenient form of biometrics that will be crucial in enhancing anti-fraud technology. Whereas one type of biometrics provides a decent security against would-be hackers, two provide significantly greater protection, resulting in lower fraud rates. The use of both face and voice biometrics makes the verification process nearly impregnable to fraudsters, [..]

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Computer Chips - IR Cameras, AI Predict Boiling Crisis

Boiling is a complicated physical phenomenon involving at least two phases of matter. Many factors contribute to the system. Liquid to gas conversion takes energy from heated surfaces, preventing overheating in everything from nuclear power plants to powerful computer chips. However, if surfaces become too heated, they may undergo a boiling crisis. Bubbles form quickly [..]

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Time And Temperature Sensitive Optical Sensors

A new wearable sensor can measure tissue oxygenation through the skin. A 3D-printed housing, a sensor head, and an adhesive oxygen sensing film make up the device. Electronic components process the sensor data and communicate via Bluetooth or Wi-Fi. The sensor detects the phosphorescence lifetime and intensity of the acrylic oxygen sensing film. Two LEDs [..]

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Kirigami Design – Curvy Camera For Night Vision

Researchers have developed a camera with a curvy, adaptable imaging sensor that could improve image quality in endoscopes, night-vision goggles, artificial compound eyes, and fish-eye cameras. They designed the camera using Kirigami, the Japanese art of paper cutting. Existing curvy imagers are flexible but not compatible with tunable focal surfaces or stretchable but having low [..]

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