Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

Abstract

Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement *Deng Hai-Dong(邓海东) a)b) , Sun Ting(孙 婷) a) , Zhao Wei-Ren(赵韦人) c) , Fu Zhi-Cheng(符志成) a) , Dai Qiao-Feng(戴峭峰) a) , Wu Li-Jun(吴立军) a) , Lan Sheng(兰 胜) a) † , and Achanta Venu Gopal d)

Ultralow-Intensity Magneto-Optical and Mechanical Effects in Metal Nanocolloids

“…In fact, the polarization-dependent excitation of surface plasmon polaritons (SPPs) via magnetic induction currents is not only highly efficient, but the resulting plasmons are potentially comparable in strength to those excited by electric fields [15]. Furthermore, the plasmon-assisted modulation of the refractive index is achieved with the application of magnetic fields [16][17][18]. Correspondingly, ferromagnetic materials are often mated with noble metals to achieve the MO response.…”

“…The plasmonic resonances of noble metal nanostructures manifest in the visible spectral range and have a fundamental role in shaping the optical properties of materials. , At such resonances the electromagnetic fields are concentrated around subwavelength structures producing high local field enhancements, which has been the study of many investigations. − Because the resonances are highly dependent on the refractive index of the material, as well as the surrounding medium, methods that modify a materials refractive index, that is, electro-optically , or thermally, are realized by a shift in the plasmonic resonance. An external magnetic field can also modulate a material’s optical properties if the material exhibits magneto-optical (MO) behavior. − The concurrent application of a magnetic field is associated with additional phenomena such as increased Faraday rotation, MO enhancement of localized and propagating surface plasmons, , or introduction of new magnetic modes. − Observations of these MO phenomena, however, are generally small unless the plasmonic material is mated with a ferromagnet. Another class of MO responses involves nonoscillating, direct current (dc), magnetic modes.…”