Dynamic Pyroelectric Properties and Their Frequency Dependences of $LiTaO_3$ crystal

$LiTaO_3$crystal Dynamic 초전 특성과 그 주파수 의존성

In this paper, we have investigated the pyroelectric characteristics of the $20\mu\textrm{m}-thick$ $LiTaO_3$ single crystal with black coating by using the nondestructive dynamic method. The $LiTaO_3shows$ the maximum pyroelectric coefficient (${\gamma}$) of $1.56$\times$10-8C/\textrm{cm}^2K$ at 40Hz and the responsivity (Rv) is 488V/W at 2Hz. The noise equivalent power (NEP) is obtained as 3.95$\times$10-10W/√Hz at 40Hz. The detectivity (D*) is obtained divided by the sample area and estimated to be 5.6$\times$108cm√Hz/W at 40Hz. These results, shows that the $LiTaO_3$ single crystals are the best candidates to pyroelectric IR sensors.