TY - JOUR JF - ijop JO - IJOP VL - 8 IS - 2 PY - 2014 Y1 - 2014/7/01 TI - Tip sensor probe for changing refractive index measurement in small volumes TT - N2 - In this paper, a tapered tip optical fiber probe sensor for localized refractive index (RI) measurements is presented. This sensor’s interaction with analytes is confined to a few micro-meters which makes it a promising candidate for in-vivo or even intra-cellular RI monitoring. This tapered tip was simply fabricated by etching optical fiber with hydrofluoric acid to a conic shape with a sub-micrometer aperture. The sensor was calibrated for RI measurement using different concentrations of NaCl in water. Limit of detection of 6.7×10-5 RIU was achieved for this low-cost sensor. SP - 105 EP - 111 AU - Nikbakht, Hamed AU - Latifi, Hamid AU - Amini, Tahereh AU - Zibaii, Mohammad Ismail AD - Laser & Plasma Research Institute, Shahid Beheshti University KW - etching KW - intra-cellular sensor KW - optical fiber tip KW - refractive index KW - tapered optical fiber UR - http://ijop.ir/article-1-172-en.html ER -