"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Micro-ball lens based optical biosensors

V. JOHN1,* , M. Z. MUHAMMAD1, N. IRAWATI1, N. M. ALI1, S. W. HARUN1

Affiliation

  1. Department of Electrical Engineering, Faculty of Engineering, University of Malaya 50603 Kuala Lumpur Malaysia

Abstract

A new optical biosensor is proposed and demonstrated using a new microfiber based structure so called micro-ball lens to sense glucose and uric acid concentration in distilled water. The micro-ball lens is formed at the cleaved tip of the microfiber coupler using an arcing technique. In the proposed sensor, the lens acts as a probe while a reflector is used as a target, is immersed into various concentrations of the glucose and uric acid solutions. It is observed that the intensity of the output power decreases linearly as the glucose concentration is varied from 0 % to 20 % with a sensitivity of 0.27 dB / % and a linearity of more than 98%. On the other hand, as the solution concentration of the uric acid varies from 0 to 500 ppm, the received reflected light intensity of the sensor decreases linearly from -58.1 dBm to -67.8 dBm with a sensitivity of 0.02 dB/ppm and a slope linearity of more than 99 %. The stability, high sensitivity and simplicity of the micro-ball lens probe make this new glucose and uric acid sensors are attractive alternative to other optical based sensing techniques..

Keywords

Fiber sensors; Microfiber devices; Biosensors; Glucose sensor; Uric acid sensor.

Submitted at: Oct. 1, 2015
Accepted at: Oct. 28, 2015

Citation

V. JOHN, M. Z. MUHAMMAD, N. IRAWATI, N. M. ALI, S. W. HARUN, Micro-ball lens based optical biosensors, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 11-12, pp. 1656-1600 (2015)