Compact optical switch based on 2D photonic crystal and magneto-optical cavity

Abstract

A compact optical switch based on a 2D photonic crystal (PhC) and a magneto-optical cavity is suggested and analyzed. The cavity is coupled to two parallel and misaligned PC waveguides and operates with dipole mode. When the cavity is nonmagnetized, the dipole mode excited by a signal in the input waveguide has a node in the output waveguide. Therefore, the input signal is reflected from the cavity. This corresponds to the state off of the switch. Normal to the plane of the PhC magnetization by a dc magnetic field produces a rotation of the dipole pattern in the cavity providing equal amplitudes of the electromagnetic fields in the input and the output waveguides. This corresponds to the state on with high transmission of the input signal. Numerical calculations show that at the 1.55 μm wavelength the device has the insertion loss -0.42 dB in the on state, the isolation -19 dB in the off state and the switch off and on ratio P(on)/P(off) about 72. The frequency band at the level of -15 dB of the resonance curve in off state is about 160 GHz.

Tunability of Size and Magnetic Moment of Iron Oxide Nanoparticles Synthesized by Forced Hydrolysis

“…Furthermore, they offer a high magnetic moment due to their superparamagnetism and as a result do not contain any residual paramagnetism after removal of the external magnetic field [12]. Apart from applications in biomedical sciences, iron oxide nanoparticles can be used in ferrofluids, Faraday isolators, magnetization-induced second harmonic generation, and magneto-optical materials [13,14,15,16,17,18,19]. Common methods to make such particles are co-precipitation with sodium hydroxide or ammonia [20], microemulsion [21], hydrothermal synthesis or thermal decomposition in organic solvents [22,23].…”

Tunable Optical Nanocavity of Iron-garnet with a Buried Metal Layer

“…So far, almost all magneto-optical resonators have been based on using a thin magnetic film sandwiched in-between two dielectric Bragg mirrors, and these structures are commonly referred to as 1D magnetophotonic crystals [12,13,14,15]. Magneto-optical cavities inside 2D and 3D periodic dielectric structures were studied as well [16,17]. Enhancement of the Faraday effect by an order of magnitude has been gained.…”

Wideband compact 2D photonic crystal switch based on ferrite resonator in square lattice with 90° bending

“…In our previous article , we suggested two‐dimensional (2D) PhC switches based on MO resonator and discussed two possible mechanisms of switching. In nonmagnetized ferrite resonator, the mechanism is based on a standing mode (usually dipole one).…”

“…The bandwidth of the switches discussed in depends on many factors. Among others, the bandwidth is defined by mechanism of switching, that is, by the type of resonator modes (standing or rotating) involved in the switching process.…”