Novel Devices ♦ news digest obtained using the GaN BAW resonators.
The results showed that, in effect, pumping electrical energy into the system can be used to offset the mechanical losses. This dynamic and reversible improvement in the Q of PS-BAW resonators can be distinctly observed on applying a DC electric field. The experimental work focused on GaN as it is a high-quality acoustic PS material predicted to be optimal for demonstrating acousto- electric amplification. Other PS materials (CdS, ZnO H-SiC, GaAs, InP, InGaAs, and AlAs41) could also be potentially used to achieve Q-amplified BAW resonators, say the researchers.
An important question arising from this work, say the researchers, is whether one can overcome all other sources of loss in a practical PS-BAW resonator and achieve frequency-selective resonant BAW amplifiers. To demonstrate this experimentally, they say, further investigation is necessary into PS-BAW resonators made with high-quality thin-film materials, such as GaN, CdS, or ZnO. Ideally, the resonators should be optimized for low reflection loss, operated under controlled pressure/ temperature, and stimulated with continuous wave or pulsed DC excitation. This would enable exhaustive investigation into acousto-electric interactions in PS materials and encourage the design of a new class of high-performance acousto- electrically amplified resonant devices.
This is a very brief summary of the paper Phonon-Electron Interactions in Piezoelectric Semiconductor Bulk Acoustic Wave Resonators by Vikrant J. Gokhale and Mina Rais-Zadeh. from Nature Scientific Reports 4, Article number: 5617 doi:10.1038/srep05617
objects from being copied.
QMC is known for making tetrapod-shaped quantum dots (QD) for medical, display, solar energy and lighting applications. Compared to their spherical cousins, tetrapod QDs offer advantages such as higher brightness, more colours, the use of less active material, better stability and longer lifetime.
By using tetrapod quantum dots with specific structural characteristics, or dual emission tetrapods that can emit two different colours, the company says it can further increase the security measures inherent in the Virginia Tech process.
“The remarkable number of variations of semiconductor nanomaterials properties QMC can manufacture, coupled with Virginia Tech’s anticounterfeiting process design, combine to offer corporations extreme flexibility in designing physical cryptography systems to thwart counterfeiters,” said David Doderer, QMC’s VP for research and development.
IBM Announces $3 Billion Research Initiative To Tackle Chip Grand Challenges
Scientists and engineers start to work on a post- silicon future
IBM today announced it is investing $3 billion over the next five years in two research programs to push the limits of chip technology needed to meet the emerging demands of cloud computing and Big Data systems.
Quantum dots to combat piracy
3D printing technology embeds quantum dots to produce unique security signature
Quantum Materials Corporation, based in Texas USA, has acquired a technology to embed quantum dots into 3D-printed objects as a kind of security signature. QMC hopes that this 3D-printing/additive manufacturing approach, developed at Virginia Tech in the US, will be a way of protecting 3D printed
One program will be aimed at ‘7 nanometer and beyond’ silicon technology to address the challenges threatening current semiconductor scaling techniques. The second will focus on alternative technologies for post-silicon era chips using new materials and circuit architectures, including III-V technologies, silicon photonics, carbon nanotubes, low power transistors, graphene, quantum computing, and neurosynaptic computing.
The research teams, who will focus on providing orders of magnitude improvement in system level performance and energy efficient computing, will
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