Magneto-photonic crystal optical sensors with sensitive covers

Abstract

We report on a magneto-photonic crystal on-chip optical sensor for specific analyte detection with polypyrrole and gold nano particles as modified photonic crystal waveguide cover layers. The reaction of the active sensor material with various analytes modifies the electronic structure of the sensor layer causing changes in its refractive index and a strong transduction signal. Magneto-photonic crystal enhanced polarization rotation sensitive to the nature of the cover layer detects the index modification upon analyte adsorption. A high degree of selectivity and sensitivity are observed for aqueous ammonia and methanol with polypyrrole and for thiolated-gold-with gold-nanoparticles covers.

Tunable multifunctional magneto-optical devices based on magnetophotonic crystals comprising liquid crystal defect layers

“…An interesting property to note is that the former can suitably be implemented to design a refractive-index-based sensing tool for every quantity that is able to alter e LC continuously in its whole tuning range, i.e., the dynamic range of the corresponding sensor. 31,32 Note that the mentioned invariance of the reflectance is also crucial for this application to be handled straightforwardly due to the fact that it is the Kerr signal which is normally measured to represent the Kerr effect. When this was not true, variations in the reflected intensity would, in general, alter the output signals irregularly.…”

The effect of 1D magneto-photonic crystal defect mode on Faraday rotation

“…MPhcs provide interesting optical responses, such as the Faraday rotation, Kerr effect, and enhanced magnetic circulators. These phenomena are vital to many optoelectronics components [6][7][8][9][10][11][12]. Inoue et al studied the magneto-optical properties of one-dimensional photonic crystals (YIG and nonmagnetic dielectric) theoretically and experimentally [13].…”

Faraday Effect in Bi-Periodic Photonic-Magnonic Crystals

“…These devices, based on the Faraday effect, or polarization plane rotation of light transmitted through magnetic medium, are necessary for the construction of optical systems for quantum metrology. The Faraday rotation (FR) can be also used for sensing of magnetic state [2] or even for chemical detection techniques [3]. The gaining of larger rotation angles of polarization plane in optical devices or achieving the sufficient sensitivity of detection based on the FR effect is however challenging in miniaturized systems.…”