As the recent demand for optical interconnections is increased, much attention has been paid to silicon photonics because of the small device footprint and CMOS compatible process. An optical isolator is essential for protecting optical active devices from reflected light even in short-distance transmission systems.
Figure caption: (A) Schematic illustration of an SOI waveguide optical isolator based on MZI, (B) Process of direct bonding technique, (C) Microscope image of a fabricated optical isolator, (D) Measured fiber-to-fiber transmittance of the fabricated optical isolator as a function of the wavelength.
However, the bottleneck of integrated optical isolator lies in difficulty in growing magneto-optical garnet crystals on commonly used optical waveguide platforms such as silicon.
Yuya Shoji and Tetsuya Mizumoto of Tokyo Institute of Technology, approached the problem using a direct bonding technique which realizes direct contact of different materials. The authors have demonstrated the first optical isolator on silicon waveguide platforms.
In this paper published in Science and Technology of Advanced Materials, they describe the direct bonding, design of the waveguide isolator, and recent progress on a silicon isolator with an optical isolation of 30 dB and a four port optical circulator. They also introduce approaches done by other research groups in the paper.
Compared to the state-of-the-art deposition approach, the bonding technique is advantageous because a single-crystalline magneto-optical garnet having a large magneto-optical effect can be used.
E-mail: email@example.com and firstname.lastname@example.org
From ancient fossils to future cars
21.10.2016 | University of California - Riverside
Study explains strength gap between graphene, carbon fiber
20.10.2016 | Rice University
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Power and Electrical Engineering
25.10.2016 | Process Engineering