Tunable magnetic fluid grating by applying a magnetic field

Abstract

A kind of tunable magnetic fluid grating is developed in this letter. The operating principle of the tunable magnetic fluid grating is analyzed theoretically. When the absorption coefficient modulation of the grating is not too large, the energy of the zeroth-order diffracted light can be transferred to that of the higher-order completely and vice versa. Experiments are done to investigate the tunable diffraction properties of the magnetic fluid grating, and the transfer of the energy of the zeroth-order diffracted light to that of the higher-order is apparent.

Relaxation property of the magnetic-fluid-based fiber-optic evanescent field modulator

“…Based on these optical properties, many MF-based photonic devices can be made. Recently, some schemes for the applications of the MF to photonic devices have been proposed by some researchers and some sample photonic devices ͑for instance, MF light modulator, 21 MF optical switch, 22,23 MF coarse wavelength-division multiplexer, 24 MF Mach-Zehnder interferometer, 25 MF grating, 26 MF optical-fiber modulator, [27][28][29] etc.͒ have been demonstrated in the laboratories and their qualities have been experimented. An obstacle to the applications of the MF to practical use in the optical field is its relatively large extinction coefficient.…”

Tuning the band gap of self-assembled superparamagnetic photonic crystals in colloidal magnetic fluids using external magnetic fields

“…Accordingly, many practical applications based on the uniquely magnetic and colloidal features of magnetic fluids have been realized or are under intensive research [25][26][27]. In addition, the remarkable optical properties and late-model applications to photonic devices of colloidal magnetic fluids have been explored and proposed since the end of the 20th century [28][29][30][31][32]. Magnetic fluids, as optically functional materials in colloidal phase, are also excellent candidates for fabricating PCs, especially the band-gap-tunable PCs.…”

Magnetic Field Sensing Based on Magnetic-Fluid-Clad Fiber-Optic Structure With Up-Tapered Joints

“…So far, versatile properties have been demonstrated (e.g., tunable refractive index (RI) [2], [3], magneto-volume variation [4] and magneto-dielectric anisotropy [5]). Many potential optical and sensing applications based on MFs have been proposed, such as optical switches [6], optical gratings [7], [8], tunable optical capacitors [9], modulators [10], [11], tunable slow-light [12], and magnetic field sensors [2]- [4], [13]- [21]. Due to the fluidity of MFs, they can be easily integrated with fibers.…”