速度提升1万倍，纳米级超快光开关新突破！

Core Viewpoint - Researchers from the University of Oldenburg have developed an ultra-fast optical switch made from extremely thin semiconductor layers, which operates approximately 10,000 times faster than current electronic transistors, presenting vast application prospects for optical data processing [2]. Group 1: Technology and Innovation - The new optical device, designed as a light switch or optical transistor, is based on a prototype described as a "active metamaterial" made from silver and atomically thin semiconductor layers [2][4]. - The prototype can control light on a timescale of femtoseconds (one femtosecond equals one quadrillionth of a second) [4]. - The research team utilized a super-thin silver nano-slit array and milled a parallel groove grid on its surface, with each groove measuring approximately 45 nanometers [4]. Group 2: Mechanism and Functionality - The combination of the two materials into a hybrid nanostructure resulted in extraordinary light response, which individually did not exhibit switching effects [6]. - Light incident on the nanostructure is temporarily stored in a mixed quantum state known as exciton-plasmon polaritons for about 70 femtoseconds before being reflected [6]. - The interaction between light and bound electron-hole pairs (excitons) occurs strongly in this state, allowing for significant control over the reflected light [6]. Group 3: Experimental Results and Implications - The research team was able to change the brightness of the reflected light by up to 10% using external laser pulses to alter the interaction strength [8]. - This study marks the first time that shorter light pulses than the observed switching process were used to investigate metamaterials [8]. - The ultra-fast optical switch could significantly increase the amount of data transmitted per unit time, while traditional electronic transistors are about 1,000 times slower [8]. Group 4: Future Applications - Optical technology is seen as the only way to enhance the clock frequency of traditional computers [8]. - The development of nanoscale ultra-fast optical switches may open new possibilities for chip manufacturing, optical sensors, and quantum computers [8]. - The primary task ahead is to design, customize, and optimize active metamaterials to enable these applications [8].