In this paper we have designed the photonic crystal sensor for the detection of underwater pressure using finite difference time domain method. By using the photonic crystal with rods in air configuration, this photonic sensor is designed. Designed sensor is investigated for different pressure values and different values of wavelength are obtained. Two structures are designed, but design 2 photonic sensing structure is more preferred than design 1 because of its high sensitivity values. The highest sensitivity obtained is 369.29 nm/RIU i.e. for design 2. Photonic band gap is identified for each sensing structure and is used for the design of this pressure sensor.

在本文中，我们设计了一种光子晶体传感器，用于使用时域有限差分法检测水下压力。通过将光子晶体与空气配置的棒一起使用，可以设计出这种光子传感器。研究了设计的传感器的不同压力值，并获得了不同的波长值。设计了两种结构，但是设计2光子感应结构比设计1更可取，因为它具有较高的灵敏度值。获得的最高灵敏度为369.29 nm / RIU，即用于设计2。为每个传感结构识别出光子带隙，并将其用于此压力传感器的设计。