Document Type : Original Article

Authors

• Bahareh Mazlum Dizaji ¹
• Mohammad Vahedi ¹
• Ali Maleki ²
• Hossein Saghafifar ³

¹ School of Physics, Iran University of Science and Technology, Tehran, Iran

² Catalysts and Organic Synthesis Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran

³ Optics & Laser Science and Technology Research Center, Malek Ashtar University of Technology, Isfahan, Iran

Abstract

This paper presents the fabrication process and operation of a bio-sensor based on tapered optical fiber by using optical spectrum shift in the presence of PBS buffer and dissolved streptavidin. The taper-fiber sensors are 18 and 24 μm in diameter and are fabricated by use of an oxy-butane torch. The optical spectrum is obtained using a broadband light source and an optical spectrum analyzer (OSA) in a 40 nm wavelength range. The existence of streptavidin on the tapered fiber surface is confirmed. The experiments on PBS buffer have shown that, the output spectrum demonstrates a red-shift by adding the streptavidin. The maximum sensitivity obtained is 29000 nm/RIU.

Keywords

• tapered fiber
• biosensor
• streptavidin
• biological buffer

Main Subjects

• Optics and Photonics