LAUSR

A better behaved and easily controlled optical communication device could improve the performance of signal transmission. Here, we present an optomechanical transistor within cavity-optomechanical system, where the coupled phonons–photons interfere with the input signal photons while the pump field controls the transmission spectrum of the signal laser. We demonstrate the existence of transmitted signal attenuation and amplification through the optomechanical transistor when switching OFF and ON the pump field, respectively. By increasing the input pump power, the output signal gain can be further enhanced abruptly. The proposed optomechanical transistor that has the advantages of simple manufacture technology, low cost, convenient replacement, normal working environment, and so on could be implemented in current experiments and pave the way for all-optical logic circuits and quantum repeaters.