Pyroelectric Materials and Devices

Pyroelectric and piezoelectric properties of thick PZT films produced by a new sol–gel route

“…1 The figures-of-merit agree reasonably with the values obtained from literature for sol-gel films (data compiled in reference). 5 Only the high loss tangent and the high dielectric constant of the ferroelectric films obviously degrades F D , and devices built with this material are supposed to have a higher dielectric-loss generated Johnson noise than one reported for modified PZT ceramics, 1 Table 1.…”

“…Furthermore, compatibility with silicon technology presents the advantage of active film deposition directly on read-out circuitry which can result in cheap devices. 5 A versatile method for the processing of thin films is via solution deposition which allows films of up to 1 m thickness to be fabricated in a cost-effective way. Thicker films can be achieved by spin-coating a sol filled with fine dispersion of ceramic particles.…”

Metamaterial Electromagnetic Wave Absorbers

“…[ 156 ] In the pyroelectric detector, absorbed energy is sensed by a material that has a temperature dependent dielectric function, and the material forms a portion of a sensitive capacitive circuit. [ 157 ] These devices fi nd good use in the IR wavelengths range and are particularly useful at THz frequencies. Traditional absorptive devices that have been used in microbolometers and pyroelectric detectors include metal black coatings, [ 158 ] carbon nanotubes, [ 159 ] and anti-resonant cavities (the most widely used).…”

Infrared detectors: an overview

“…Recently, very encouraging results have been obtained with micromachined silicon bolometer [10,12] and pyroelectric detector arrays [10,13].…”