Investigation of resonance enhancement through non-uniform piezoelectric polarization for information storage methodology

TLDR: In this paper, the authors investigate the use of non-uniform poling to enhance specific resonances for the case of a square PZT wafer, which can be used with a QR-type encoding scheme.

Abstract: Non-traditional information storage has become increasingly ubiquitous as a means of providing interactive, environment-specific information. Two popular examples of this are Optical Quick Response (QR) codes and Radio-Frequency Identification (RFID) tags, which are used in product tags, anti-theft systems, tamper-evident seals, logistics, etc. From a security point-of-view though, these two examples have unique drawbacks. Optical QR codes can be easily viewed and replicated because they are limited to the surface of objects, and RFID tags are prone to remote RFID skimming. With this in mind, we are investigating a PZT-based information storage method which has visibly indistinguishable features, is incompatible with skimming, and can be used with a QR-type encoding scheme. This information storage method involves a frequency-dependent array of transducers with engineered resonance profiles. In this proceedings, we investigate methods of engineering these resonance profiles for the case of a square PZT wafer. Specifically, we investigate the use of non-uniform poling to enhance specific resonances. Simulation results and a discussion of changes to the resonance characteristics resulting from non-uniform poling are included.