Computational an‎d Experimental Study of the Effect of Successive Reflection of the Laser Beam on the Behavior of Surface Plasmon Resonance

1/15/2026 12:00:00 AM

In this thesis, the effect of multiple reflections on the performance of a surface plasmon resonance (SPR) sensor in the Kretschmann configuration, employing a prism an‎d metallic layers of chromium an‎d gold, has been investigated. In the theoretical part, Maxwell’s equations an‎d Fresnel relations were applied, an‎d a dedicated computational program was developed to simulate the behavior of electromagnetic fields within the metallic an‎d dielectric media. The influence of various structural an‎d environmental parameters on the reflectance curve was also analyzed. In the experimental part, two approaches—“multi-step imaging” an‎d “optical signal measurement using a photodetector an‎d oscilloscope”—were employed to compare practical outcomes with the computational results. The findings reveal that multiple reflections preserve the resonance angle while reducing reflectance intensity, increasing resonance depth, an‎d broadening the resonance curve. These changes enhance angular stability an‎d lead to a relative improvement in sensor sensitivity, demonstrating that multiple reflections can serve as an effective factor in optimizing the design an‎d improving the accuracy an‎d reliability of SPR sensors for diverse applications.

تشديد پلاسمون سطحي , پيكربندي كرشمن , بازتابهاي متوالي

Surface Plasmon Resonance , kretschmann configuration , multiple reflections

Milad Asgharnia

Dr. Mohamadhosein Mahdiye_ Dr. Mahdi Shayegan manesh