2 research outputs found
100 GHz Plasmonic Photodetector
Photodetectors
compatible with CMOS technology have shown great potential in implementing
active silicon photonics circuits, yet current technologies are facing
fundamental bandwidth limitations. Here, we propose and experimentally
demonstrate for the first time a plasmonic photodetector achieving
simultaneously record-high bandwidth beyond 100 GHz, an internal quantum
efficiency of 36% and low footprint. High-speed data reception at
72 Gbit/s is demonstrated. Such superior performance is attributed
to the subwavelength confinement of the optical energy in a photoconductive
based plasmonic-germanium waveguide detector that enables shortest
drift paths for photogenerated carriers and a very small resistance-capacitance
product. In addition, the combination of plasmonic structures with
absorbing semiconductors enables efficient and highest-speed photodetection.
The proposed scheme may pave the way for a cost-efficient CMOS compatible
and low temperature fabricated photodetector solution for photodetection
beyond 100 Gbit/s, with versatile applications in fields such as communications,
microwave photonics, and THz technologies
Atomic Scale Photodetection Enabled by a Memristive Junction
The
optical control of atomic relocations in a metallic quantum
point contact is of great interest because it addresses the fundamental
limit of “CMOS scaling”. Here, by developing a platform
for combined electronics and photonics on the atomic scale, we demonstrate
an optically controlled electronic switch based on the relocation
of atoms. It is shown through experiments and simulations how the
interplay between electrical, optical, and light-induced thermal forces
can reversibly relocate a few atoms and enable atomic photodetection
with a digital electronic response, a high resistance extinction ratio
(70 dB), and a low OFF-state current (10 pA) at room temperature.
Additionally, the device introduced here displays an optically induced
pinched hysteretic current (optical memristor). The photodetector
has been tested in an experiment with real optical data at 0.5 Gbit/s,
from which an eye diagram visualizing millions of detection cycles
could be produced. This demonstrates the durability of the realized
atomic scale devices and establishes them as alternatives to traditional
photodetectors