Amirkabir University of Technology AUT Journal of Electrical Engineering 2588-2910 54 Issue 2 (Special Issue) 2022 12 01 Optical Sensors for Industrial and Biomedical Applications 333 342 4835 10.22060/eej.2022.21376.5471 EN Amideddin Mataji-Kojouri Photonics Research Lab., School of Electrical and Computer Engineering, College of Engineering University of Tehran, Tehran, Iran Amirsaman Nooramin School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran * shahabad@ut.ac.ir 0000-0002-3853-9824 Mahmoud Shahabadi Photonics Research Lab., School of Electrical and Computer Engineering, College of Engineering University of Tehran, Tehran, Iran 0000-0003-1321-9936 Journal Article 2022 05 06 This article begins with a brief review of those industrial and biomedical optical sensors which have been designed and fabricated in Photonics Research Laboratory at the University of Tehran. Firstly, development of a fiber-based fluid temperature and pressure sensing system is described. Afterwards, a frequency-modulation interferometric sensor enabling low-cost and highly sensitive refractive index measurement is presented. Having introduced these categories of sensors, we briefly describe the Transmission-Line Formulation (TLF) method which has been developed for the diffraction analysis of optical periodic structures. The application of this method is demonstrated to the design of a coupled cross-stacked Guided-Mode Resonance sensor with a high surface sensitivity.  We further review the design of dual-resonance nanostructured plasmonic sensors that can be used to differentiate background refractive index variation from adsorption of a layer on the sensing surface, and to estimate the thickness of adsorbed layers.  Finally, we use the TLF method to design a spectrometer-free configuration for a dual-mode plasmonic sensor, which substantially simplifies the measurement setup. https://eej.aut.ac.ir/article_4835_20546457187cf3d52ea86538403e47cc.pdf