Do you know what the speed limit for optoelectronic devices is?

2022-06-06 0 By

We usually think that the speed of electronic products will always be faster.But given the laws of physics, this is an obvious paradox.A paper just published in Nature Communications describes the speed limit that optoelectronic devices can reach.We know that electronic devices, especially systems that control electrons with light, also face an upper limit to the speed of light. Scientists have now calculated that limit, and quantum mechanics is a big obstacle to making microchips go faster.The team used a semiconductor material plus a laser to carry out the experiment.An ultra-short laser pulse hits a semiconductor, causing electrons in the material to shift to a higher energy state that allows them to move freely, and a second, longer laser pulse (fired in one direction) generates an electric current.Using this technique and sophisticated computer simulations, the team struck the semiconductor with shorter and shorter laser pulses.But at some point, this process starts to collide with The uncertainty principle of Naibao.As a strange kind of quantum field, the more accurately one tries to measure one property of a particle, the less certain it is about the other.In this case, using a shorter laser pulse means the observer can tell exactly when the electrons are gaining energy.At the expense of both, we can’t accurately measure how much energy they gain.This is obviously a very important problem for electronic devices, and not knowing the exact energy of the electrons means they cannot be controlled precisely.From this, the team calculated that the absolute upper limit on the speed that a photoelectronic system could reach was 1 petahertz (PHz), or gigahertz — an impenetrable barrier before the laws of quantum physics fell into.Details of The research have been published in The March 25, 2022, issue of Nature Communications under The original title “The Speed Limit of Optoelectronics.”