Optical methods are experimental and analytical techniques that exploit the interaction of electromagnetic radiation in the ultraviolet, visible, or infrared ranges with matter to probe, manipulate, or measure physical, chemical, or biological systems. They encompass approaches such as absorption, fluorescence, and Raman spectroscopy, interferometry, optical microscopy, and optical coherence tomography, relying on phenomena including reflection, refraction, diffraction, scattering, and emission. These methods provide high spatial and temporal resolution, enable non-contact and often non-destructive measurements, and are widely used for quantitative imaging, material characterization, environmental sensing, and in situ monitoring of dynamic processes in both fundamental research and applied technologies.
A research team has engineered a "broadband nanogap gold spectroscopic sensor" using a flexible material capable of bending to create a controlled gap. With the developed technology, it is possible to rapidly test various ...
Bio & Medicine
Apr 17, 2024
0
30
Researchers have incorporated a swept illumination source into an open-top light-sheet microscope to enable improved optical sectioning over a larger area of view. The advance makes the technique more practical for nondestructive ...
Optics & Photonics
Mar 20, 2024
0
24
On a cold, sunny day, you're driving on a rural road, surrounded by snow-covered fields. In an instant, your eyes process the scene, picking out individual objects to focus on—a stop sign, a barn—while the rest of the ...
Optics & Photonics
Feb 13, 2024
0
26
The past few decades have seen astonishing advances in imaging technology, from high-speed optical sensors that process over two million frames per second to tiny lensless cameras that record images using a single pixel.
Nanophysics
Jan 24, 2024
0
29
Quantitative photoacoustic tomography (QPAT) is a medical imaging technique that combines laser-induced photoacoustic signals and ultrasound detection to create detailed three-dimensional images of biological tissues. The ...
Optics & Photonics
Jan 11, 2024
0
29
A team of researchers has proposed an indirect optical method for determining internal temperatures of opaque packed beds based on phosphor thermometry. This method enables simultaneous multi-point measurements using an image-based ...
General Physics
Jan 8, 2024
0
28
Researchers at Concordia have developed a new system using tiny nanosensors called carbon dots to detect the presence of the widely used chemical glyphosate. Their research, titled "Ratiometric Sensing of Glyphosate in Water ...
Bio & Medicine
Aug 30, 2023
0
32
Researchers at Columbia Engineering have developed a new class of integrated photonic devices—"leaky-wave metasurfaces"—that can convert light initially confined in an optical waveguide to an arbitrary optical pattern ...
Nanophysics
May 8, 2023
0
67
Fiber sensing scientists at Shenzhen University have developed a compact fiber optical nanomechanical probe (FONP) for measuring in vivo biomechanical properties of tissue and even single cells.
Bio & Medicine
Feb 10, 2023
0
33
Optical tweezers (OTs), also known as optical traps, are highly focused laser beams that can be used to trap and manipulate microscopic objects with a noncontact force. Employed in a wide range of nano and micro-scale operations, ...
Bio & Medicine
Oct 12, 2022
0
5
