Nano- and micro-electromechanical resonators
A resonator including a piezoelectric plate and an interdigital electrode is provided. A ratio between a thickness of the plate and a pitch of the interdigital electrode may be from about 0.5 to about 1.5. A radiation detector including a resonator and an absorber layer capable of absorbing at least one of infrared and terahertz radiation is provided. A resonator including a piezoelectric plate and a two-dimensional electrically conductive material is provided.
1. A resonator comprising:
a piezoelectric plate, and
a first interdigital electrode including a plurality of conductive strips disposed on a first surface of the piezoelectric plate, wherein the plurality of conductive strips are arranged with a pitch;
wherein a ratio between a thickness of the piezoelectric plate and the pitch of the first interdigital electrode is from about 0.5 to about 1.5.
2. The resonator of claim 1 , wherein the thickness of the piezoelectric plate is from about 25 nm to about 500 nm.
3. The resonator of claim 1 , wherein the piezoelectric plate comprises at least one of aluminum nitride, lithium niobate, lithium tantalite, zinc oxide, gallium nitride and quartz.
4. The resonator of claim 1 , wherein the resonator further comprises a second interdigital electrode disposed on a second surface of the piezoelectric plate opposing the first surface.
5. The resonator of claim 1 ,
wherein a combined mode of vibration comprising a thickness-extensional mode and a lateral-extensional mode is excited in the piezoelectric plate in response to an alternating current (AC) applied through the first interdigital electrode.
6. The resonator of claim 5 , wherein both d 31 and d 33 piezoelectric coefficients contribute to the combined mode of vibration.
7. The resonator of claim 5 , wherein a frequency of the combined mode of vibration is at least about 10 MHz to about 100 GHz.