Sensing of Surface and Bulk Refractive Index Using Magnetophotonic Crystal with Hybrid Magneto-Optical Response

Abstract

We propose an all-dielectric magneto-photonic crystal with a hybrid magneto-optical response that allows for the simultaneous measurements of the surface and bulk refractive index of the analyzed substance. The approach is based on two different spectral features of the magneto-optical response corresponding to the resonances in p- and s-polarizations of the incident light. Angular spectra of p-polarized light have a step-like behavior near the total internal reflection angle which position is sensitive to the bulk refractive index. S-polarized light excites the TE-polarized optical Tamm surface mode localized in a submicron region near the photonic crystal surface and is sensitive to the refractive index of the near-surface analyte. We propose to measure a hybrid magneto-optical intensity modulation of p-polarized light obtained by switching the magnetic field between the transverse and polar configurations. The transversal component of the external magnetic field is responsible for the magneto-optical resonance near total internal reflection conditions, and the polar component reveals the resonance of the Tamm surface mode. Therefore, both surface- and bulk-associated features are present in the magneto-optical spectra of the p-polarized light.

Magnetophotonics for sensing and magnetometry toward industrial applications

“…The second effect arises from the change of the coupling efficiency of the incident light to the TSM, which is proportional to cos 2 (Ψ inc À Ψ TSM ), where Ψ inc is the polarization of the incident light and Ψ TSM is the polarization of the TSM. This effect is called a magnetophotonic intensity effect and was demonstrated for the longitudinal 114 and polar 115 configurations of the magnetic field and can also be observed in specially designed structures in a transverse magnetization configuration. 116 Due to the mixed eigenmode polarization, the resonance of TSM is seen as the intensity effect in both polarizations of the incident light.…”

“…121 The MO scheme of measurements could improve the performance of such sensors since both of the TM and TE modes are observed in the same δ spectra if both H 1 and H 2 have the transverse and polar components. 115 In this case, two resonances in the δ spectra of the same beam are independently sensitive to the bulk and surface refractive indices [Fig. 6(b)].…”

“…[131][132][133][134][135] Since noble metals exhibit smaller losses than FM metals, hybrid noble-FM metallic nanostructures have also been exploited for magnetoplasmonic approaches. 46,53,77,136,137 These works have motivated various applications, including sensing, 51,61,78,115,138,139 telecommunications, [140][141][142][143][144] and magnetometry. 145,146 It is significant that the large losses from hybrid magnetoplasmonic nanostructures, considered a major drawback for biosensing, are suitable for nanoparticle-based hyperthermia and drug delivery.…”

On the fabrication of one-dimensional magnetophotonic crystals from various oxides and metal–organic decomposition-made Bi0.5Y2.5Fe5O12

“…The following pairs of high-and low-refractive index oxides were selected for BM manufacturing: HfO 2 /SiO 2 , Ta 2 O 5 /SiO 2 and ZrO 2 /SiO 2 . The following BMs were deposited on UV grade fused silica (14 S-7-2, Standa) substrates: (HfO 2 /SiO 2 ) 8 , (Ta 2 O 5 /SiO 2 ) 7 and (ZrO 2 /SiO 2 ) 7 . The layers were deposited using the EBE technique.…”

“…known materials due to light localization and, therefore, it is a platform for miniature MO (spatial) light modulators [3,4], superprism, [5] and one-way propagating Tamm states [6]. Also, MPCs are of interest for optical sensor applications [7][8][9] and optical control of magnetization by the inverse Faraday effect [10].…”