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Polariton Condensate Transistor Switch
T. Gao, P. S. Eldridge, T. C. H. Liew, S. I. Tsintzos, G. Stavrinidis, G. Deligeorgis, Z. Hatzopoulos, P. G. Savvidis
TL;DR
The paper addresses the need for optical transistor switches that avoid scattering, capacitance, resistivity, and high switching powers. It realizes a polariton condensate transistor in a microcavity ridge, using a weaker gate beam to control ballistic polariton flux through an engineered energy landscape, with attenuation approaching 90% and operation frequencies of tens of gigahertz.
Problem
Optical circuits lack a viable transistor analogue because switching and operating powers are typically high, while electronics face limits from scattering, capacitance, and resistivity.
Method
A source condensate in a microcavity ridge ballistically ejects polaritons, while a second weaker beam gates their flux by modifying the polariton energy landscape.
Results
A gate beam 20 times weaker than the source controls the polariton flux, achieving attenuation approaching 90% and nearly completely switching off collector feeding at sub-threshold gate power.
Takeaways & Limitations
The demonstrated spatial control of polariton flux supports an all-optical polariton transistor suitable for optoelectronic and all-optical schemes.
Takeaways & Limitations
The incomplete energy-relaxation regime is challenging to describe quantitatively because it requires a dynamical treatment of non-equilibrium condensation alongside energy relaxation within condensed modes.
Abstract
from arXiv · showhide
A polariton condensate transistor switch is realized through optical excitation of a microcavity ridge with two beams. The ballistically ejected polaritons from a condensate formed at the source are gated using the 20 times weaker second beam to switch on and off the flux of polaritons. In the absence of the gate beam the small built-in detuning creates potential landscape in which ejected polaritons are channelled toward the end of the ridge where they condense. The low loss photon-like propagation combined with strong nonlinearities associated with their excitonic component makes polariton based transistors particularly attractive for the implementation of all-optical integrated circuits.