Phononic crystal devices
| DWPI Title: Radiofrequency identification tag device for e.g. tagging application, has piezoelectric crystal generating voltage signal at frequencies at which thermal generated phonons are not suppressed by phononic crystal |
| Abstract: Phononic crystals that have the ability to modify and control the thermal black body phonon distribution and the phonon component of heat transport in a solid. In particular, the thermal conductivity and heat capacity can be modified by altering the phonon density of states in a phononic crystal. The present invention is directed to phononic crystal devices and materials such as radio frequency (RF) tags powered from ambient heat, dielectrics with extremely low thermal conductivity, thermoelectric materials with a higher ratio of electrical-to-thermal conductivity, materials with phononically engineered heat capacity, phononic crystal waveguides that enable accelerated cooling, and a variety of low temperature application devices. |
| Use: Radiofrequency identification tag (RFID) device for a tagging application, a RADAR application and an inter-chip communication. |
| Advantage: The phononic crystal thermally suppresses generated phonons in the frequency bands having terahertz frequencies, thus performing thermal management and noise mitigation in the tag device. The phononic crystal modifies and controls thermal black body phonon distribution and phonon component of heat transport in a solid material, where thermal conductivity and heat capacity of the solid material can be modified by altering phonon density of states in the phononic crystal, thus achieving the tag device powered by ambient heat dielectrics having extremely low thermal conductivity, a thermoelectric material having a higher ratio of electrical-to-thermal conductivity. |
| Novelty: The device has a phononic crystal i.e. nano-scale phononic crystal, for suppressing thermally generated phonons in a set of frequency bands, where the phononic crystal has a set of cascaded phononic crystal sections including different lattice constants or different crystal lattice types. A piezoelectric crystal acoustically coupled to the phononic crystal generates a voltage signal at a set of frequencies at which the thermal generated phonons are not suppressed by the phononic crystal. An antenna electromagnetically transmits the voltage signal to an exterior. |
| Filed: 2/27/2009 |
| Application Number: US2009394831A |
| Tech ID: SD 10663.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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