plasmons tagged posts

Team Manages to Dynamically Control Trions with a Waveguide

Fig. 1
 Illustration of propagating SPP and exciton-to-trion conversion with dynamic optical modulation. a Schematic diagram of all-optical trion control platform operating with adaptive optical excitation. Green dashed line indicates transferred MoS2 ML. b Illustration of all-optical trion control platform facilitated by nanoscale strain gradient, plasmon-induced hot electrons, and resultant exciton-to-trion conversion. c Illustration of hot electron injection process from Au to MoS2 ML in SPP mode. d Strain (ϵ) and corresponding bandgap energy change (ΔE) diagram of MoS2 ML as function of distance x, where gray region indicates nanogap area. e Adaptive wavefront shaping using stepwise sequence feedback algorithm to find optimal phase mask (left) and dynamic excitonic emission modulation thro...
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Novel ‘Converter’ heralds breakthrough in Ultra-fast Data Processing at Nanoscale

2017-1020-nanoscale.jpg

A research team led by Associate Professor Christian Nijhuis from the Department of Chemistry at the NUS Faculty of Science (second from right) has recently invented a novel “converter” that can harness the speed and small size of plasmons for high frequency data processing and transmission in nanoelectronics.

Invention bagged 4 patents and could potentially make microprocessor chips work 1000X faster. Advancement in nanoelectronics has been fueled by the ever-increasing need to shrink the size of electronic devices in a bid to produce smaller, faster and smarter gadgets such as computers, memory storage devices, displays and medical diagnostic tools.

While most advanced electronic devices are powered by photonics – which involves the use of photons to transmit information – photonic e...

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Quantum Nanoscope: Seeing electrons surfing the waves of light on Graphene

Electrons and light are moving in concert along the graphene sheet. Credit: ICFO/ F. Vialla

Electrons and light are moving in concert along the graphene sheet.
Credit: ICFO/ F. Vialla

Researchers have studied how light can be used to “see” the quantum nature of an electronic material. They managed to do that by capturing light in a net of carbon atoms and slowing down light it down so that it moves almost as slow as the electrons in the graphene. Then something special happens: electrons and light start to move in concert, unveiling their quantum nature at such large scale that it could observed with a special type of microscope.

The experiments were performed with ultra-high quality graphene...

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Lighting the Way to Miniature devices

A schematic (left) and photograph (right) of a photonic dew point temperature sensor developed by Ji Fang Tao and co-workers, which works by detecting changes in the refraction of light as water molecules condense onto the device.

A schematic (left) and photograph (right) of a photonic dew point temperature sensor developed by Ji Fang Tao and co-workers, which works by detecting changes in the refraction of light as water molecules condense onto the device. (left) © 2015 IEEE. Reprinted, with permission, from Ref 1. (right) © 2016 A*STAR Institute of Microelectronics

Electromagnetic waves created on a layer of organic molecules could provide the perfect on-chip light source for future quantum communication systems...

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