Photonic circuits made reprogrammable: Page 2 of 2

April 03, 2020 //By Julien Happich
Photonic circuits
Researchers at Eindhoven University of Technology have designed a novel type of photonic integrated circuits (PICs) whose switching properties (light routing states) can be reprogrammed via light-soaking and thermal annealing steps.

"Most importantly, in comparison to current methods, the time to prototype is much shorter and much more accurate", says Raz who anticipates the method could be improved to further reduce prototyping times.

Next, the researchers designed a reconfigurable optical switch based on a micro-ring resonator (MRR) which they subjected to cycles of light soaking and heating treatments to exploit the metastable refractive index property a‐Si:H. Through multiple light soaking and heating steps, they reported the repeatable and reversible switching of the device’s resonance wavelength by 0.3nm. Further experiments show that the reversible refractive index changes were correlated to the metastable volumetric expansion (and strain) of the structure of the a‐Si:H membrane used.

Eindhoven University of Technology - www.tue.nl

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