Experimental investigations on magnetically induced photonic band gap in ferrodispersions
Department of Physics, Bhavnagar University, Bhavnagar 364022, GJ, India
Corresponding author: email@example.com
Revised: 2 July 2010
Accepted: 10 September 2010
Published online: 30 November 2010
We show here that at a certain externally applied static magnetic field of moderate value, photonic band gap (PBG) is induced at optical frequencies in a stable colloidal dispersion containing a mixture of micron and nano sized magnetite spheres. The PBG is found to depend on the size of microspheres and is observed for only TM mode of the incident waves. Effect of nonmagnetic doping on the PBG is also discussed. The observed effects are attributed to the magnetically induced morphological dependent resonance (MDR) in the micron sized magnetic spheres. The technique to induce PBG may be easily amenable for lab-on-chip devices.
© EDP Sciences, 2010