HOME ABOUT CONTACT AVAILABLE ISSUES SUBSCRIBE MEDIA & ADS CONFERENCE CALENDAR
LATEST UPDATES » Vol 21, No 09, September 2017 – Infectious Diseases       » Breakthrough in pig-to-human organ transplant       » Silk-based wearable body sensors developed by Tsinghua researchers       » First AI-assisted treatment center in Hefei city       » Breakthrough immunotherapy for Chronic Hepatitis B virus infection       » First in Asia - Launch of multi-centre lung cancer research platform       » NUS establishes additive manufacturing facilities for biomedical applications      
BIOBOARD - UNITED STATES
To trap a rainbow, slow down light
A new material that halts and absorbs light may lead to advances in solar energy, stealth technology, and other fields, experts report.

Researchers developed a “hyperbolic metamaterial waveguide” that halts and ultimately absorbs each frequency of light, at slightly different places in a vertical direction, to catch a “rainbow” of wavelengths. The technology is essentially an advanced microchip made of ultra-thin films of metal and semiconductors and/or insulators.

“Electromagnetic absorbers have been studied for many years, especially for military radar systems,” says Qiaoqiang Gan, an assistant professor of electrical engineering at University at Buffalo.

“Right now, researchers are developing compact light absorbers based on optically thick semiconductors or carbon nanotubes. However, it is still challenging to realize the perfect absorber in ultra-thin films with tunable absorption band.

“We are developing ultra-thin films that will slow the light and therefore allow much more efficient absorption, which will address the long existing challenge.”

Light is made of photons that, because they move extremely fast, are difficult to tame. In their initial attempts to slow light, researchers relied upon cryogenic gases, which are very cold—roughly 240 degrees below zero Fahrenheit—and difficult to work with outside a laboratory.

Gan previously helped pioneer a way to slow light without cryogenic gases. He and other researchers at Lehigh University made nanoscale-sized grooves in metallic surfaces at different depths, a process that altered the optical properties of the metal. While the grooves worked, they had limitations. For example, the energy of the incident light cannot be transferred onto the metal surface efficiently, which hampered its use for practical applications.

As reported in the journal Scientific Reports, the waveguide solves that problem because it is a large area of patterned film that can collect the incident light efficiently. It is referred to as an artificial medium with subwavelength features whose frequency surface is hyperboloid, which allows it to capture a wide range of wavelengths in different frequencies, including visible, near-infrared, mid-infrared, terahertz, and microwaves.

Researchers say the technology could lead to advancements in an array of fields.

For example, in electronics there is a phenomenon known as crosstalk, in which a signal transmitted on one circuit or channel creates an undesired effect in another circuit or channel. The on-chip absorber could potentially prevent this.

The on-chip absorber may also be applied to solar panels and other energy-harvesting devices. It could be especially useful in mid-infrared spectral regions as thermal absorber for devices that recycle heat after sundown, Gan says.

Technology such as the stealth bomber involves materials that make planes, ships, and other devices invisible to radar, infrared, sonar, and other detection methods. Because the on-chip absorber has the potential to absorb different wavelengths at a multitude of frequencies, it could be useful as a stealth-coating material.

Source: University at Buffalo/ Futurity

Click here for the complete issue.

NEWS CRUNCH  
news Singapore leads the world in progress toward the health Sustainable Development Goals (SDGs)
news HIMSS AsiaPac17 conference and exhibition returns to address Asia's health IT challenges
news Vitafoods Asia 2017: Meeting the region's nutraceutical needs
PR NEWSWIRE  
Asia Pacific Biotech News
EDITORS' CHOICE  

Lady Ganga: Nilza'S Story
COLUMNS  
Subscribe to APBN E-Newsletter
Find us under 'Others' option to receive APBN e-newsletters thrice a month!

APBN Editorial Calendar 2017
January:
Healthcare Focus: LUNGS
February:
War on CANCER
March:
Get to Know TCM
April:
Diabetes: The Big Picture
May:
The Piece of Your Mind - Brain Health/Science
June:
Advocacies in Support of Rare Disease Patients
July:
Food Science & Technology
August:
Eye – the Window to your Soul
September:
Infectious Diseases
October:
No. 1 Killer — Heart Diseases
November:
Diseases threatening our Children
December:
Skin Diseases/Allergic Reactions
Editorial calendar is subjected to changes.
MAGAZINE TAGS
About Us
Events
Available issues
Editorial Board
Letters to Editor
Instructions to Authors
Advertise with Us
CONTACT
World Scientific Publishing Co. Pte. Ltd.
5 Toh Tuck Link, Singapore 596224
Tel: 65-6466-5775
Fax: 65-6467-7667
» For Editorial Enquiries:
   biotech_edit@wspc.com or Ms Lim Guan Yu
» For Subscriptions, Advertisements &
   Media Partnerships Enquiries:
   biotech_ad@wspc.com
Copyright© 2017 World Scientific Publishing Co Pte Ltd  •  Privacy Policy