Navigation Links
Optical boomerangs, ultralight fractal materials, and more
Date:11/13/2012

Optical Boomerangs

P. Aleahmad et al.

Physical Review Letters (forthcoming)

P. Zheng et al. Physical Review Letters, 109, 193901 (2012)

Bending light around corners is usually done with mirrors, but now scientists have realized self-bending light beams that propagate along curved paths.

Two independent groups have reported experiments on special light waves that can skid around curves. The researchers demonstrated that modified laser beams can be made to move along parabolic and elliptical paths. Furthermore, if obstacles are in their path, these beams can self-heal, regrouping and continuing on their way. The research shows that such self-bending behavior can be achieved in both two and three dimensions. These sort of "optical boomerangs" could be used to move particles around with laser tweezers, or to manipulate optical data on an optoelectronic chip.


Ultralight Fractal Materials

Daniel Rayneau-Kirkhope, Yong Mao (contact author), Robert Farr Physical Review Letters (forthcoming)

Researchers have studied theoretically how ultralight materials can be built based on a fractal design: a geometry whose patterns look the same when observed at different scales.

Their design strategy is based on a hierarchical approach: elementary units are first assembled that can be used as building blocks for the next level of assembly. The resulting structures, reminiscent of the metal frame of the Eiffel Tower, are to a large extent hollow, yet they are predicted to retain the same mechanical properties of standard materials. The scheme is particularly suited to design large structures with limited load, such as solar sails that propel spacecrafts, whose weight may be reduced by a factor of 100 or more.


Meson Decay Shows the Arrow of Time

Jean-Pierre Lees et al.

Physical Review Letters (forthcoming)

By measuring the decay of certain subatomic particles called B- mesons, scientists have found the first evidence that, even at the microscopic level, time flows in a preferred direction.

While most things in the macroscopic world only get older, many of the fundamental laws of physics are perfectly time-symmetric: according to the standard model most physical process can be "rewound" to go exactly back to where they started. According to theory, an exception is the electroweak interaction, the force responsible for the radioactive decay of nuclear subatomic particles. The BaBar collaboration at the SLAC National Acceleration Laboratory at Stanford has now proven this experimentally. BaBar compared the decay of B-mesons, running the process in both the forward and backward direction. The result showed that the decay is different in the two cases, providing the first direct experimental evidence for the violation of time reversal symmetry.


'/>"/>

Contact: Matteo Rini
mrini@aps.org
631-591-4224
American Physical Society
Source:Eurekalert

Related biology news :

1. Optical waveguide connects semiconductor chips
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2017)... NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or the "Company"), ... Report on Form 10-K on Thursday April 13, 2017 with the ... The ... section of the Company,s website at http://www.nxt-id.com  under "SEC Filings," ... 2016 Year Highlights: Acquisition of ...
(Date:4/11/2017)... BEACH GARDENS, Fla. , April 11, 2017 ... identity management and secure authentication solutions, today announced ... contract by Intelligence Advanced Research Projects Activity (IARPA) ... for IARPA,s Thor program. "Innovation has ... onset and IARPA,s Thor program will allow us ...
(Date:4/11/2017)... , April 11, 2017 NXT-ID, Inc. ... technology company, announces the appointment of independent Directors Mr. ... to its Board of Directors, furthering the company,s corporate governance ... Gino ... we look forward to their guidance and benefiting from their ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... The Blavatnik ... Winners and six Finalists of the 2017 Blavatnik Regional Awards for Young Scientists. ... Foundation and administered by the New York Academy of Sciences to honor the ...
(Date:10/12/2017)... ... October 12, 2017 , ... BioMedGPS announces expanded coverage of ... newest module, US Hemostats & Sealants. , SmartTRAK’s US Market for Hemostats and ... synthetic sealants and biologic sealants used in surgical applications. BioMedGPS estimates the market ...
(Date:10/11/2017)... ... October 11, 2017 , ... At its national board ... Suneel I. Sheikh, the co-founder, CEO and chief research scientist of Minnesota-based Advanced ... for membership in ARCS Alumni Hall of Fame . ASTER Labs is ...
(Date:10/11/2017)... ... October 11, 2017 , ... ComplianceOnline’s Medical Device Summit is ... and 8th June 2018 in San Francisco, CA. The Summit brings together current and ... distinguished CEOs, board directors and government officials from around the world to address key ...
Breaking Biology Technology: