http://www.theengineer.co.uk/sector...idly-turn-a-switch-on-and-off/1014158.article "The researchers’ new device has two optical waveguides, each carrying an optical signal. Placed between the waveguides is an optical resonator. In the optical resonator, light can circulate hundreds of times, gaining intensity. Using this resonance effect, the optical signal in the first waveguide is enhanced in the resonator and generates a very strong optical force on the second waveguide." Can someone help me please? What is an optical force in the context of this article?