![]() Here, using the same technique, Lončar and his team etched coupled ring-resonators and waveguides on thin-film lithium niobate. In previous research, Lončar and his team demonstrated a technique to fabricate high-performance lithium niobate microstructures using standard plasma etching to physically sculpt microresonators in thin lithium niobate films. Lithium niobate can efficiently convert electronic signals into optical signal but was long considered by many in the field to be difficult to work with on small scales. The paper outlines two types of on-chip frequency shifter - one that can covert one color to another, using a shift of a few dozen gigahertz, and another that can cascade multiple shifts, a shift of more than 100 gigahertz.Įach device is built on the lithium niobate platform pioneered by Lončar and his lab. "Our frequency shifters could become a fundamental building block for high-speed, large-scale classical communication systems as well as emerging photonic quantum computers," said Marko Lončar, the Tiantsai Lin Professor of Electrical Engineering and senior author of the paper. The frequency shifters are easily controlled, using continuous and single-tone microwaves. ![]() Paulson School of Engineering and Applied Sciences (SEAS) have developed highly efficient, on-chip frequency shifters that can convert light in the gigahertz frequency range. Now, researchers from the Harvard John A. Today, most frequency shifters are either too inefficient, losing a lot of light in the conversion process, or they can't convert light in the gigahertz range, which is where the most important frequencies for communications, computing, and other applications are found. One of the hardest properties to change is a photon's color, otherwise known as its frequency, because changing the frequency of a photon means changing its energy.
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