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Volume 25 - ICOP & ICPET 2019
ICOP & ICPET _ INPC _ ICOFS 2019, 25 - ICOP & ICPET 2019: 1021-1024 |
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Nasiri A, Asadishad T, Hamidi S M. Design of Highly sensitive 2D plasmonic refractive index biosensor. ICOP & ICPET _ INPC _ ICOFS 2019; 25 :1021-1024
URL: http://opsi.ir/article-1-1658-en.html
URL: http://opsi.ir/article-1-1658-en.html
1- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
Abstract: (2114 Views)
During the last few years with the significant developments in nanoscience and technology, a new field of science has been introduced which made it possible for human to design and manufacture the applications such as nano biosensors. These nanostructures with a dimension which is less than the wavelength of the exciting incident wave are made of metal and dielectric layers. The surface plasmons are the result of the interaction between electromagnetic waves and free electrons mass at the shared boundary of metal and dielectric. Since the propagation constant of these waves is strongly dependent on the changes in the dielectric medium, this feature of plasmons are used to detect the changes in mediums. In this biosensor, the information of these changes in mediums can be achieved by analyzing the structures optic response variation. The proposed plasmonic structure in this paper, as a refractive index sensor, is a kind of sensor with a simple structure which has a period of 800 nm, which is easy to operate due to the use of gold and Poly-dimethyl-siloxane polymers in the structure. Favorable results were reached by optimizing the structure in near infrared range and studying the absorption spectrum of the structure for two samples of water and neurons, which showed that this structure with 77% absorption, sensitivity 715 and figure of merit 12.4% is suitable for the sensor applications in the medicine.
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