Category Physics

This image shows the self-folding process of smart shape-memory materials with slightly different responses to heat. Using materials that fold at slightly different rates is important to ensure that the components do not interfere with one another during the process. Credit: Credit: Qi Laboratory, Georgia Tech

Using components made from smart shape-memory materials with slightly different responses to heat, researchers have demonstrated 4D printing technology that allowed creation of complex self-folding structures. The technology, from Georgia Institute of Technology and Singapore University of Technology and Design (SUTD), could be used to create 3D structures that sequentially fold themselves from components that had been flat or rolled into a tube for shipment...

Single GeV center in diamond. (left) Fluorescence mapping and (right) atomic structure model. Credit: Tokyo Institute of Technology

Germanium defects in a diamond crystal lattice act as a reliable source for single photons. Pure diamonds are naturally colorless, but gaps in the crystal structure or impurities of other elements can create colors and even emit fluorescence. Recently, researchers have shown that the fluorescent lattice defects could be useful as single photon sources for quantum cryptography and as bright luminescent makers in living cells.

Now a new type of diamond crystal defect that fluoresces to produce single photons in a narrow, high energy wavelength band has been demonstrated...

Single GeV center in diamond. (left) Fluorescence mapping and (right) atomic structure model. Credit: Tokyo Institute of Technology Read more at: http://phys.org/news/2015-09-diamond-bright-luminescence-quantum-crypotography.html#jCp

Germanium defects in a diamond crystal lattice act as a reliable source for single photons. Pure diamonds are naturally colorless, but gaps in the crystal structure or impurities of other elements can create colors and even emit fluorescence. Recently, researchers have shown that the fluorescent lattice defects could be useful as single photon sources for quantum cryptography and as bright luminescent makers in living cells.

Now a new type of diamond crystal defect that fluoresces to produce single photons in a narrow, high energy wavelength band has been demo...

PQED consists of a Brewster window (left) protecting the detector elements from impurities, adjustable bellows and the detector chamber itself. In order to further decrease uncertainties in measurement, the window was removed and the detector was protected from impurities using nitrogen flow.

Researchers at Aalto University and VTT Technical Research Centre of Finland have succeeded in developing a method which helps to improve the relative uncertainty in measuring the luminous efficacy of LEDs from the approximate 5% of today to 1% in the future.

“Thus far, solutions based on incandescent lamps have been used in photometry, i.e. in measuring light detected by the human eye,” explains Tomi Pulli, alto University...