Journal
ADVANCED MATERIALS
Volume 30, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802435
Keywords
phase-change materials; photonic computing; photonic logic; photonic memories; pulse-width modulation
Categories
Funding
- Engineering and Physical Sciences Research Council Manufacturing Fellowships [EP/J018694/1]
- Wearable and Flexible Technologies (WAFT) collaboration [EP/M015173/1]
- Chalcogenide Advanced Manufacturing Partnership [EP/M015130/1]
- European Union's Horizon 2020 research and innovation program [780848]
- EPSRC [EP/M015130/1, EP/M015173/1, EP/J018694/1] Funding Source: UKRI
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Inspired by the great success of fiber optics in ultrafast data transmission, photonic computing is being extensively studied as an alternative to replace or hybridize electronic computers, which are reaching speed and bandwidth limitations. Mimicking and implementing basic computing elements on photonic devices is a first and essential step toward all-optical computers. Here, an optical pulse-width modulation (PWM) switching of phase-change materials on an integrated waveguide is developed, which allows practical implementation of photonic memories and logic devices. It is established that PWM with low peak power is very effective for recrystallization of phase-change materials, in terms of both energy efficiency and process control. Using this understanding, multilevel photonic memories with complete random accessibility are then implemented. Finally, programmable optical logic devices are demonstrated conceptually and experimentally, with logic OR and NAND achieved on just a single integrated photonic phase-change cell. This study provides a practical and elegant technique to optically program photonic phase-change devices for computing applications.
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