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Proceedings Paper

High-resolution magnetic field biosensor based on optical resonators
Author(s): Amir R. Ali; Abdelkarim Saleh
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Paper Abstract

In this paper, we study the effect of using magnetorheological polydimethylsiloxane (MR-PDMS) spheres as micro optical resonators. Recently, optical sensors based on whispering gallery mode (WGM) have drawn much attention due to the high optical quality factors they can exhibit with several applications in a variety of fields. The modes of such resonators are highly affected by changes in morphology of the cavity (for instance: shape, size or refractive index) caused by a change in the physical input we are aiming to measure. In the presence of a magnetic field, the embedded particles become polarized, exerting forces upon one another because of dipolar interactions. In our case, these forces lead to changes in the morphology of the resonator through mechanical deformation of the size, which in turn causes WGM shifts. Experiments were conducted on earthworms for the similarity of the nerve impulses flowing which mimic those of human body specifically the brain and ultra-small magnetic fields can then be detected. Moreover, the coupling of a MR cantilever beam to the optical resonator leads to additional induced forces for the same magnetic field input and thus increasing the resolution by 3 orders of magnitude. Results indicate that the proposed sensor can be used for magnetic field detection with high quality factor and resolution.

Paper Details

Date Published: 17 May 2018
PDF: 12 pages
Proc. SPIE 10685, Biophotonics: Photonic Solutions for Better Health Care VI, 106851F (17 May 2018); doi: 10.1117/12.2307587
Show Author Affiliations
Amir R. Ali, The German Univ. in Cairo (Egypt)
Southern Methodist Univ. (United States)
Abdelkarim Saleh, The German Univ. in Cairo (Egypt)

Published in SPIE Proceedings Vol. 10685:
Biophotonics: Photonic Solutions for Better Health Care VI
Jürgen Popp; Valery V. Tuchin; Francesco Saverio Pavone, Editor(s)

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