A phase modulator capable of tuning the light phase between 0 and 2? in situ has been developed by researchers at the Institute of Photonic Sciences (ICFO) and Columbia University.
To achieve this light phase modulation, the research team exploited the wavelength tunability of graphene plasmons. In their experiment, they used high quality graphene and build a fully functional phase modulator with a device footprint of 350nm, which was 30 times smaller than the wavelength of the infrared light used for the experiment.
A near-field microscope was used to excite and image the plasmons, which the researchers claim gave them an unprecedented insight into the plasmon properties, such as their wavelength and phase.
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