Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Scientists in Singapore develop novel ultra-fast electrical circuits using light-generated tunneling currents

A focused electron beam (in yellow) was used to characterise the structures and to probe the optical properties of two plasmonic resonators bridged by a layer of molecules with a length of 0.5 nm.Credit: Tan Shu Fen, National University of Singapore
A focused electron beam (in yellow) was used to characterise the structures and to probe the optical properties of two plasmonic resonators bridged by a layer of molecules with a length of 0.5 nm.

Credit: Tan Shu Fen, National University of Singapore

Abstract:
Scientists in Singapore have successfully designed and fabricated electrical circuits that can operate at hundreds of terahertz frequencies, which is tens of thousands times faster than today's state-of-the-art microprocessors. This scientific breakthrough has the potential to revolutionise high-speed electronics, nanoscale opto-electronics and nonlinear optics.

Scientists in Singapore develop novel ultra-fast electrical circuits using light-generated tunneling currents

Singapore | Posted on April 10th, 2014

Assistant Professor Christian A. Nijhuis of the Department of Chemistry at the National University of Singapore's (NUS) Faculty of Science, in collaboration with researchers from the Agency for Science, Technology and Research (A*STAR), namely Dr Bai Ping of the Institute of High Performance Computing and Dr Michel Bosman of the Institute of Materials Research and Engineering, has successfully designed and fabricated electrical circuits that can operate at hundreds of terahertz frequencies, which is tens of thousands times faster than today's state-of-the-art microprocessors.

This novel invention uses a new physical process called ‘quantum plasmonic tunnelling'. By changing the molecules in the molecular electronic device, the frequency of the circuits can be altered in hundreds of terahertz regime. The new circuits can potentially be used to construct ultra-fast computers or single molecule detectors in the future, and open up new possibilities in nano-electronic devices. The study is funded by the National Research Foundation (NRF) and A*STAR and results of the research were first published in prestigious scientific journal Science on 28 March 2014.

The quest to be super-small and super-fast

Light is used as an information carrier and transmitted in optical fibre cables. Photonic elements are large but they operate at extremely high frequencies of 100 terahertz - about 10,000 times faster than the desktop computer. But current state-of-the-art nano-electronic devices operate at length scales that are much smaller, making it very difficult to combine the ultra-fast properties of photonic elements with nano-scale electronics.

Scientists have long known that light can interact with certain metals and can be captured in the form of plasmons, which are collective, ultra-fast oscillations of electrons that can be manipulated at the nano-scale. The so-called quantum plasmon modes have been theoretically predicted to occur at atomic length scales. However, current state-of-the-art fabrication techniques can only reach length scales that are about five nanometre larger, therefore quantum-plasmon effects have been difficult to investigate.

In this landmark study, the research team demonstrated that quantum-plasmonics is possible at length scales that are useful for real applications. Researchers successfully fabricated an element of a molecular electronic circuit using two plasmonic resonators, which are structures that can capture light in the form of plasmons, bridged by a layer of molecules that is exactly one molecule thick. The layer of molecules switches on the quantum plasmonic tunneling effects, enabling the circuits to operate at terahertz frequencies.

Dr Bosman used an advanced electron microscopy technique to visualise and measure the opto-electronic properties of these structures with nanometer resolution. The measurements revealed the existence of the quantum plasmon mode and that its speed could be controlled by varying the molecular properties of the devices.

By performing quantum-corrected simulations, Dr Bai confirmed that the quantum plasmonic properties could be controlled in the molecular electronic devices at frequencies 10,000 times faster than current processors.

Explaining the significance of the findings, Asst Prof Nijhuis said, "We are very excited by the new findings. Our team is the first to observe the quantum plasmonic tunneling effects directly. This is also the first time that a research team has demonstrated theoretically and experimentally that very fast-switching at optical frequencies are indeed possible in molecular electronic devices."

The results open up possible new design routes for plasmonic-electronics that combines nano-electronics with the fast operating speed of optics.

Further research

To further their research, Asst Prof Nijhuis and his team will look into resolving the challenges that are presented in the course of their work, such as the integration of these devices into real electronic circuits. They are also following up with new ideas that are developed from these results.

####

About National University of Singapore
A leading global university centred in Asia, the National University of Singapore (NUS) is Singapore’s flagship university which offers a global approach to education and research, with a focus on Asian perspectives and expertise.

NUS has 16 faculties and schools across three campuses. Its transformative education includes a broad-based curriculum underscored by multi-disciplinary courses and cross-faculty enrichment. Over 37,000 students from 100 countries enrich the community with their diverse social and cultural perspectives.

NUS has three Research Centres of Excellence (RCE) and 23 university-level research institutes and centres. It is also a partner in Singapore’s 5th RCE. NUS shares a close affiliation with 16 national-level research institutes and centres. Research activities are strategic and robust, and NUS is well-known for its research strengths in engineering, life sciences and biomedicine, social sciences and natural sciences. It also strives to create a supportive and innovative environment to promote creative enterprise within its community.

For more information, please click here

Contacts:
Carolyn Fong
+65 6516 6666

Copyright © National University of Singapore

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

UK NANOSAFETY GROUP publishes 2nd Edition of guidance to support safe working with nanomaterials May 30th, 2016

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Chip Technology

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Gigantic ultrafast spin currents: Scientists from TU Wien (Vienna) are proposing a new method for creating extremely strong spin currents. They are essential for spintronics, a technology that could replace today's electronics May 25th, 2016

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Dartmouth team creates new method to control quantum systems May 24th, 2016

Optical computing/Photonic computing

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Photon collisions: Photonic billiards might be the newest game! May 20th, 2016

UW researchers unleash graphene 'tiger' for more efficient optoelectronics May 16th, 2016

How light is detected affects the atom that emits it: An experiment suggests it might be possible to control atoms entangled with the light they emit by manipulating detection May 15th, 2016

Discoveries

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Announcements

UK NANOSAFETY GROUP publishes 2nd Edition of guidance to support safe working with nanomaterials May 30th, 2016

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Photonics/Optics/Lasers

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Photon collisions: Photonic billiards might be the newest game! May 20th, 2016

We’ll Leave the Lights On For You: Photonics advances allow us to be seen across the universe, with major implications for the search for extraterrestrial intelligence, says UC Santa Barbara physicist Philip Lubin - See more at: http://www.news.ucsb.edu/2016/016805/we-ll-leave-li May 17th, 2016

UW researchers unleash graphene 'tiger' for more efficient optoelectronics May 16th, 2016

Quantum nanoscience

Researchers demonstrate size quantization of Dirac fermions in graphene: Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices May 20th, 2016

Graphene: A quantum of current - When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene May 20th, 2016

Technique improves the efficacy of fuel cells: Research demonstrates a new phase transition from metal to ionic conductor May 18th, 2016

Theorists smooth the way to modeling quantum friction: New paradigm offers a strategy for solving one of quantum mechanics' oldest problems May 18th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic