▎ 摘　　要

NOVELTY - The modulator has an upper reflector and a lower reflector arranged with each other in a parallel manner. A supporting sealing layer is fixed between the upper reflector and the lower reflector. The upper reflector, the lower reflector and the supporting sealing layer are inserted into an optical vacuum micro-cavity, where the optical vacuum micro-cavity includes an upper micro-cavity and a lower micro-cavity. A multilayer film composite structure is fixed between the upper reflector and the lower reflector in a parallel manner. The upper micro-cavity and the lower micro-cavity are filled with metal saturated steam i.e. rubidium atom or cesium atom saturated steam. An insulation layer is made of boron nitride or silicon dioxide. USE - Graphene ultra-narrow band electro-optical modulator. ADVANTAGE - The modulator can effectively modulate light in a specific wavelength range under small electric field so as to effectively reduce power consumption rate and cost of the modulator. The modulator can improve filtering function and integration degree, and has wide application range, and improves working efficiency in complex optical environments such as free space optical communication light modulation in strong background optical environments. DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a graphene ultra-narrow band electro-optical modulator.