Physics Optics

News

22 Dec 2022
Osaka Metropolitan University scientists discovered the principle of light-induced acceleration of antigen–antibody reaction, allowing for simple, ultrafast, and highly sensitive detection of proteins. The researchers introduced target proteins and probe particles with modified antibodies selectively binding to the target proteins into a small channel and applied irradiation with infrared laser light. They achieved, for the first time, the rapid measurement of trace amounts of attogram-level target proteins after only 3 minutes of laser irradiation. These findings will potentially contribute to breakthroughs in the development of systems for ultra-early diagnosis of various diseases.
29 Aug 2022
Osaka Metropolitan University scientists developed a simple, rapid method for identifying food poisoning-inducing bacteria based on color differences in the scattered light of composite structures consisting of gold, silver, and copper nanoparticles and polymer particles. Using these composites as test labels bound to specific bacteria, the researchers detected food poisoning bacteria E. coli O26, E. coli O157, and S. aureus as white, red, and blue scattered light, respectively, under the microscope. This new method enables simultaneous identification of multiple bacterial species within one hour, significantly shortening the usual 48-hour time requirement for conventional bacterial tests.
17 Feb 2022
In a recent study published in the journal ACS Catalysis researchers from Kanazawa University describe novel scanning electrochemical cell microscopy measurements to determine sites of photoelectrochemical activity in titanium dioxide nanotubes.
1,3-Diradicals Embedded in Curved Paraphenylene Units: Singlet versus Triplet State
09 Jun 2021
Chemical rings of carbon and hydrogen atoms curve to form relatively stable structures capable of conducting electricity and more — but how do these curved systems change when new components are introduced? Researchers based in Japan found that, with just a few sub-atomic additions, the properties can pivot to vary system states and behaviors, as demonstrated through a new synthesized chemical compound.
The optical forces acting on a moving nanodiamond
26 Mar 2021
Scientists have developed a method to use lasers to control the movement of nanodiamonds with fluorescent centers.
08 Mar 2021
Researchers at Kanazawa University report in Biosensors and Bioelectronics a successful test of a sensor for measuring hydrogen peroxide concentrations near cell membranes. The sensor has the potential to become a tool for new cancer therapies.
19 Nov 2020
A research team, affiliated with South Korea's Ulsan National Institute of Science and Technology (UNIST) has discovered that when the rotational quantum states of non-polar molecules change under the influence of laser fields (non-resonant laser fields), so does their motion trajectories.
Image_iCeMS_Kamei_OpticsLetters
03 Oct 2020
A new apparatus improves how we study the effects of aiming high-field terahertz radiation at cells, with implications for regenerative medicine.
Nanopillar arrays
13 Jun 2018
Direct nanoscale patterning of LED surfaces brings new possibilities for the control of light.

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Giants in history

Physicist Narinder Singh Kapany (31 October 1926 – 4 December 2020) pioneered the use of optical fibres to transmit images, and founded several optical technology companies. Born in Punjab, India, he worked at a local optical instruments factory before moving to London for PhD studies at Imperial College. There, he devised a flexible fibrescope to convey images along bundles of glass fibres.
Charles Kuen Kao (Nov. 4, 1933 to Sept. 23, 2018) was an engineer who is regarded as the father of fibre optics. His work in the 1960s on long distance signal transmission using very pure glass fibres revolutionized telecommunications, enabling innovations such as the Internet.
Sir Chandrasekhara Venkata Raman (7 November 1888 – 21 November 1970) was an Indian physicist who performed ground-breaking research in the field of light-scattering.