Articles tagged with Optics
Using AI-driven analytical methods, researchers have created a custom OCT system that enables the objective measurement of wound progress over time. The platform shows that stiffer mechanical properties improve wound healing outcomes, with faster transition to intact regenerated tissue.
A recent paper introduces a novel optical neural network architecture that can accurately recognize target objects in the presence of multiple interferences. The system achieves high recognition accuracy across diverse scenarios, including complex settings with dynamic interferences.
Researchers have shown that topology can guide multiple, information-carrying light signals through chip-based photonic communication systems, making them more powerful and reliable. This breakthrough could enable the creation of networks of chips that communicate using light while taking advantage of topology's robustness.
Researchers developed flexible, stretchable on-chip optical tweezers (FSOT) that can trap a wide range of bioparticles across different size scales. The innovation enables high-throughput trapping beyond the diffraction limit, conformal operation on curved biological surfaces, and tunable inter-cellular interaction studies.
A new technique harnessing Fourier ptychographic microscopy and coherence scanning interferometry provides accurate 3D morphology measurements of high-aspect-ratio micro-trenches. The method achieves high lateral resolution without iterative phase retrieval, enabling robust characterization of complex structures.
A team of international researchers successfully demonstrates time-bin QKD over 120 km with an on-demand telecom semiconductor QD device. The system achieves exceptional stability and maintains high security key rates, making it suitable for real-world text message encryption applications.
Researchers at Osaka Metropolitan University discovered how shifting electric fields control light-emitting efficiency in devices like LEDs. By probing electron spin resonance, they found optimal electric field conditions for efficient recombination, leading to higher electroluminescence efficiency.
Researchers develop an induced fit growth method for Ga-based semiconductor films, enabling controlled thickness and compact surface. The method promises versatile, multifunctional substrates for diverse applications, including optoelectronic devices and neuromorphic computing.
Physicists at the University of Colorado Boulder have demonstrated a new kind of vacuum ultraviolet laser that is 100 to 1,000 times more efficient than existing technologies. The device could enable scientists to observe phenomena currently out of reach, such as following fuel molecules in real time as they undergo combustion, spottin...
Researchers optimize interferometric diffusing wave spectroscopy technique to boost weak optical field returning from the brain, achieving over 20x signal to noise ratio. The novel approach provides higher brain sensitivity compared to DCS-inspired approaches and is approximately two orders of magnitude less expensive.
Researchers develop Fourier ptychographic coherence scanning interferometry for high-aspect-ratio micro-trenches, achieving high-resolution 3D topography and lateral resolution beyond the incoherent diffraction limit. The method overcomes challenges of strong optical modulation, enabling robust and accurate measurements.
The Harvard researchers' new device is elegantly designed to be tunable, with a bilayer design that becomes geometrically chiral and able to 'read' chiral light. By using the MEMS device to continuously vary the twist angle and interlayer spacing, the team showed they could tune the device's intrinsic ability to read different chiral l...
A team of researchers from SASTRA Deemed University demonstrates a fiber-based method for compressing mid-infrared laser pulses into ultrashort, low-noise bursts efficiently. The system reduces input power from kilowatts to 80 watts, improving energy efficiency and thermal stability.
This work demonstrates a synergistic strategy utilizing water molecules and BHT additive to achieve high-quality perovskite films with low defect density, resulting in an unprecedented amplified spontaneous emission threshold of 8.987 μJ cm-2. The dual-triggered film completes ASE intensity retention after 30-day ambient storage.
Researchers have directly observed coherence collapse in quantum dot Fabry–Perot lasers, establishing practical design rules for isolator-free photonic integration. The lasers maintain telecom-grade performance even near the coherence collapse boundary.
Researchers have successfully observed and verified a topological Dirac vortex mode in terahertz photonic crystal fibers, enabling ultra-broadband signal transmission with zero polarization dispersion. This breakthrough has promising applications in terahertz sensing, subwavelength-resolution imaging, and distributed quantum networks.
Researchers summarize advances, challenges, and prospects in light management for all-perovskite tandem solar cells. Strategies focus on minimizing external optical losses and enhancing photon capture capability to improve photon-to-carrier conversion efficiency.
Scientists create metasurface that reconstructs 3D vectorial holograms with high precision, sculpting both axial intensity and polarization state. The device enables volumetric vectorial holography for secure data encoding, optical computing, and advanced photonic communication.
Researchers have developed monolithically integrated III-V membrane photonic crystal lasers on SOI using selective lateral heteroepitaxy, achieving low-threshold single-mode lasing in the telecom band. This approach enables precise control of the active region and simplified fabrication, facilitating efficient and low-cost production.
The proposed OFC-SCR technique enables parallel multi-frequency interrogation, improving measurement speed by over an order of magnitude. It also achieves high frequency response, wide dynamic measurement range, high sensing sensitivity, and excellent robustness, pushing the performance boundaries of distributed fiber-optic acoustic se...
Scientists created an all-optical activation unit using PPLN nanowaveguides to realize nonlinear activation in photonic neural networks. The device delivers high second-harmonic conversion efficiencies and supports data rates beyond 100 GHz.,
Researchers develop interferometric Image Scanning Microscopy (iISM) technique to deliver high-resolution imaging of intracellular structures in live cells without fluorescent labels. The method improves contrast-to-noise ratio and enables faster acquisition speeds, opening new opportunities for studying nanoscale cellular dynamics.
Researchers developed a multilayer grating solution to enhance RIXS efficiency in the tender X-ray range, reducing acquisition time from hours to minutes. The new spectrometer covers both soft and tender X-ray regions, offering improved performance for studying 4d transition metal materials.
A single-layer dielectric metasurface uses Möbius-inspired polarization-path inversion to achieve versatile control of light in both forward and backward directions. The device encodes six independent optical channels, including three combinations of wavelength and polarization states.
A team of scientists developed a novel LiDAR architecture featuring an ultra-high frame-wise point acquisition rate, a 102° wide FOV, and an angular resolution of 6.5 mrad. The system overcomes conventional trade-offs, enabling high-speed and high-resolution imaging.
Researchers develop method for far-field superresolution imaging by disrupting spatial shift-invariance assumption in classical imaging systems. The new method, k-space superoscillation, achieves imaging resolution more than twice the diffraction limit without post-processing, outperforming traditional real-space superoscillatory systems.
Researchers develop new material with reversible photoluminescence color switching upon heating or water exposure, opening pathway for smart optical materials. Flexible films with outstanding performance for temperature sensing and information encryption.
This study reveals that a femtosecond laser can induce a rise in electronic temperature, transiently blocking optical absorption and enabling multicolor modulation from a single material platform. The discovery opens a new pathway toward ultrafast, broadband, and energy-efficient photonic devices.
Researchers develop a new approach to grow high-quality III-V active material on silicon in the form of ordered nano-ridge arrays, supporting symmetry-protected bound states in the continuum mode. This enables strong in-plane confinement and vertical surface emission from a compact device footprint.
Researchers at the University of Colorado Boulder have developed high-performing optical microresonators that can trap light and build up its intensity. By guiding light smoothly through the resonator, they dramatically reduced light loss, allowing photons to circulate longer and interact more strongly inside the device.
The Harvard team developed a new microfabrication method to produce high-performance, curved optical mirrors with extremely smooth surfaces. The mirrors can control light at near-infrared wavelengths, enabling fast and efficient quantum networking.
A nationwide cohort study found that semaglutide initiators had a significantly higher risk of developing nonarteritic anterior ischemic optic neuropathy compared to sodium-glucose cotransporter-2 inhibitor initiators. The absolute risk was low, but clinicians and patients should be aware of this rare but evident increased risk.
Scientists report a scalable photonic neuron that processes complex data in real-time, achieving ultra-low latency. The architecture directly addresses scalability challenges and enables reconfigurable operation with temporal memory.
The AI-enhanced OC-PAM system allows for longitudinal tracking of organoids, evaluating drug response and viability. It also detects rare cells within dense spheroids using radiomics-based analysis.
Researchers develop a rigid organic crystal that emits red light under UV irradiation through excimer formation and generates green light through second harmonic generation under near-infrared exposure. The dual-mode optical behavior operates independently within the same crystal without interference.
Researchers have successfully demonstrated device-independent quantum key distribution over 100 km optical fibers, marking a significant step towards a quantum-secure internet. The breakthrough achieves provably secure quantum key generation over long distances using entangled atoms linked by high-quality optical fibers.
Researchers develop a new method to fabricate micro-supercapacitors with graphene hybrid nanostructured electrodes, achieving high power density and energy density. The technique enables precise control over electrode materials and structures, leading to improved device performance.
Researchers successfully decode 10 weak classical signals simultaneously using continuous-variable quantum dense coding in 20-km fiber channels. The channel capacity of deterministic entanglement-assisted quantum communication is increased compared to classical communication with coherent state.
A new window technology shields buildings from EMP threats while maintaining transparency. The innovative design offers broadband EMP protection with high optical transparency, suitable for practical architectural applications.
Researchers have created a hybrid polaritonic crystal that enables dynamic tuning of Bloch modes by combining low-loss α-MoO3 with electrically tunable graphene. The material exhibits electrical control over its band structure, allowing for selective enhancement of Bloch mode resonance and on-demand switching of far-field radiation.
Researchers have demonstrated an angstrom-scale electroplasmonic platform enabling giant modulation (2000% V⁻¹ ) of near-field nonlinear optical effects across a broad spectral range. The discovery provides a novel scheme for highly efficient electro-optical conversion in an infinitesimal spatial scale.
Researchers developed a phase multiplication technique harnessing laser feedback and cavity dynamics to enhance ranging resolution. Higher-order harmonics exhibit higher phase sensitivity, allowing for improved measurement accuracy.
Researchers at ICFO have successfully created a supersolid state of matter by coupling ultracold potassium atoms to light, directly imaging the crystal-like structure and its oscillating spacing. The team observed stripes forming and vanishing as the cloud size expanded or shrunk, behavior related to its superfluid nature.
Researchers have introduced a new dimension to holography called the optical operator, enabling scalability and security in holographic systems. The team demonstrated a 9-fold increase in channel capacity and a 2-bit operator-multiplexed hologram with ultra-secure encryption capabilities.
Researchers developed a comprehensive framework to describe intensity fluctuations in Spontaneous Brillouin scattering, linking its stochastic behavior to system parameters. Experimental validation confirmed theoretical predictions, revealing the universal fundamental precision limit imposed by SpBS noise on Brillouin metrology.
A new system integrates terahertz spectroscopy with deep learning to accurately image, detect, and classify explosives. It achieved a remarkable average classification accuracy of 99.42% at the pixel level for exposed samples.
Researchers develop novel thermometric method based on stimulated Brillouin scattering in gases, offering predictable and calibration-free temperature measurements. The technique enables direct retrieval of temperature from the Brillouin frequency shift, making it inherently absolute.
Researchers developed a new method for self-aligned laser transfer printing using Thermal Conductivity Gradient Carbon (TCGC) stamp, ensuring synchronous chip release and mitigating transfer errors. The SALT technique enables heterogeneous integration of diverse micro-objects onto various challenging surfaces with high accuracy and siz...
Researchers at the University of Rochester create a new process to turn ordinary metal tubes unsinkable by etching micro- and nano-pits on their surface, making them superhydrophobic. The tubes stay afloat in water, even when damaged or submerged for extended periods.
Researchers have successfully controlled the rotation of molecules suspended in liquid helium nano-droplets using a new optical centrifuge. This breakthrough enables scientists to study the behavior of exotic, frictionless superfluids and understand how molecules interact with the quantum environment at various rotational frequencies.
Physicists report the first experimental observation of quantum state transfer enabled by hidden symmetries in a network of laser-written optical waveguides. This discovery dramatically expands the design space for quantum circuits, opening the gates towards new classes of networks for secure quantum communication and cryptography.
Researchers used a custom-designed microscope to image individual lunar regolith grains, revealing the carriers and origins of their magnetism. The study provides insights into the Moon's internal structure and thermal evolution history.
A new type of optical atomic clock using ytterbium-173 ions has the potential to revolutionize timekeeping. The clock combines the high accuracy of single-ion clocks with the improved stability of multi-ion operation, making it a promising candidate for the next generation of atomic clocks.
The 2D charge-transfer Mott insulator VOCl demonstrates a strong nonlinear response and record nonlinear optical anisotropy. Its third-harmonic generation anisotropy ratio reaches ρTHG = 187, the highest known among van der Waals materials.
Guosong Hong was honored with the inaugural award for his groundbreaking research on tissue clearing, a technology that makes organs visible to visible light. His work has far-reaching applications in noninvasive diagnostic imaging and clinical translation.
Developed by a collaborative team of researchers, the novel metasurface-based platform harnesses quantum interference to enable precise sensing of subwavelength lateral displacement. The system achieves high accuracy while reducing the required number of detected photons, making it suitable for next-generation semiconductor lithography.
Researchers have developed two spectroscopic techniques based on quartz tuning fork detection, Quartz-enhanced photoacoustic spectroscopy (QEPAS) and light-induced thermoelastic spectroscopy (LITES), to improve gas sensing technology. QEPAS techniques enhance system signal strength using high-power lasers, novel excitation sources, and...
A new framework models pointing error in QKD optical wireless systems, clarifying its role in degrading secure key generation. The study found that increased beam waist and asymmetrical beam misalignment degrade performance, while increasing receiver aperture size and average photon numbers can improve it.
Researchers overcome spatial resolution limit of sum-frequency generation (SFG) spectroscopy by utilizing plasmonic near-field confinement. This breakthrough enables direct visualization of nanoscale orientation heterogeneity in interfacial molecular domains.
Researchers develop novel approach to isolate density fluctuations from signal measurements, achieving superior long-term stability. The method uses a three-dimensional atomic density model and neural networks to estimate and compensate for these disturbances in real-time.