forbidden gap meaning in English
禁隙
能隙
Examples
- Abstract : we have studied the spontaneous emission from a three - level atom with an external - driving field in a photonic crystal . as a result of quantum interference and photon localization , the population in the two upper levels displays quasi - oscillatory oroscillatory behavior . this depends on the initial atomic state and the relative positions of the two upper levels from the forbidden gap . the intensity and the phase of the external field can affect spontaneous emission from the atom . the properties are different from a three - level atom either in vacuum or in aphotonic crystal without an external driving field
文摘:讨论了在双光子驱动场作用下，三能级原子在光子晶体中的自发发射问题.由于量子干涉和光的局域化作用，两个上能级中的占据数将具有周期振荡或准周期振荡的性质，这不仅依赖于两个上能级与禁带的相对位置，同时也依赖于原子的初始状态，而且还与驱动场的强度、驱动场的入射位相有关.这些性质既与真空中带有驱动场的原子的自发发射性质不同，也有别于无驱动场作用下光子晶体中三能级原子的自发发射性质 - Such control can be realized in case where a atom interact with photonic band gap matericals when the atom is placed in photonic crystals whose density of modes is dramatically different from that of free space vacuum . it was known that control could be achieved by varying the frequency ( which leads to the changes of the relative position of the upper levels from the forbidden gap ) or by varying the photonic density of modes ( dos ) or by varying the intial atomic state
由于光子晶体具有不同于真空中的光子态密度，原子和光子带隙材料便发生相互作用，这样便可以控制原子的自发辐射。改变原子上能级与光子禁带边缘的相对位置、材料中的光子态密度或原子初态都可以控制原子的自发辐射。