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

Abstract

In this paper, we are going to demonstrate how realization of tunable magnetophotonic crystals (MPCs) is possible through introduction and investigation of a couple of structures containing a single liquid crystal (LC) defect layer. Our starting point is the recently discussed issue according to which in such structures any alteration in optical characteristics of the LC component will cause changes to happen regarding the overall magneto-optical (MO) response of the LC-based MPC. It will be shown that our optimized MPC structures are not only powerful in most respects but also multifunctional. For instance, while a structure is capable of being operated as a sensing tool with regard to the very factor that tends to control its MO response, other modes of operation offer a function of a switchable optical filter and also a perfect MO isolator.

Structural, Magnetic and Electric Characteristics of Multiferroic CoFe₂O₄/BNEuT Composite Thin Films Produced by Non-aqueous Sol-gel Process

“…Multiferroic (MF) [1][2][3][4] films are of particular interest as next-generation electromagnetic conversion materials that exhibit some combination of ferroelectric, ferromagnetic and ferroelastic properties. In particular, MFs with a strong correlation between ferroelectric and magnetic ordering are expected to find applications in devices that utilize magnetoelectric (ME) effects [5][6][7][8], such as multivalued memory storage [9,10] and magneto-optical devices [11]. However, for most single-phase MF materials, these properties can only be observed at ultralow temperatures of  40 K, and there is therefore a strong need for the development of materials that offer such functionality above room temperature.…”

Temporal coupled mode analysis of one-dimensional magneto-photonic crystals with cavity structures

“…The large MO enhancement in MPCs makes them attractive for realizing nano-sized film-type optical devices such as isolators, circulators, magnetic field sensors, MO spatial light modulators and so on [31][32][33][34][35][36][37][38][39][40][41][42][43]. As an important application, exploiting MPCs as the Faraday rotation element of an isolator leads to a significant reduction of the length compared to the conventional bulk isolators.…”

Magnetic and structural characteristics of multiferroic Fe3O4/(Bi3.25Nd0.65Eu0.10)Ti3O12 composite thin films deposited by metalorganic chemical vapor deposition

“…In recent years, magnetoelectric (ME) multiferroics (MFs), [1][2][3][4] which are materials that exhibit both ferroelectric and magnetic orders with a strong cross-correlation functionality between the two, have been the subject of considerable fundamental and practical research. In particular, MFs are expected to find applications in devices that utilize ME effects, [5][6][7][8] such as multivalued memory storage devices, 9,10) magneto-optical devices, 11) and magnetic field-modulation type piezoelectric devices. However, a significant issue is that common single-phase MF materials exhibit a comparatively small ME effect, and for laminated MF materials such as bilayer (ferromagnetic=ferroelectric) or multilayer films, the ME effect is reduced by the large clamping effect between the ferroelectric layer and the substrate.…”