一维光子晶体的带边，群速度接近于零，也就是说，如果这个结果内的光子将经

Dimensional photonic crystal with a side group velocity close to zero, i.e., if the result of the photons through this multiple reflection, within the band is not present in any of photons. In the photonic band edge corresponding to the bile stay with the edge of the liquid crystal of the reflection spectrum, so that the condition similar to the resonant cavity at the edge of the reflective sides of the spectrum is satisfied, bile leaving the liquid crystal added to the organic laser dyes, if the fluorescent spectrum of the dye and biliary left the liquid crystal reflection spectra overlap, the edge burning light reflection spectrum is the reflection forming cavity, is formed along the helical axis of the laser emission direction Fu

The edge of a one-dimensional photon crystal, the group speed is close to zero, that is, if the photons in this result will undergo multiple reflections, there is no photon in the energy band. In the edge of the photon can be bound to correspond to the edge of the reflection spectrum of the bile-residual liquid crystal, so the edge of the two sides of the reflection spectrum meets the conditions of similar resonant cavity, the organic laser dye is added to the bile-residual liquid crystal, if the fluorescent spectrum of the dye and the reflection spectrum of the bile-retained phase liquid crystal overlap, then the burned light is reflected by the reflection edge of the reflection spectrum to form a resonant cavity, Forming a laser shot along the direction of the spiral axis

At the band edge of one-dimensional photonic crystal, the group velocity is close to zero, that is to say, if the photons in this result will be reflected many times, there is no photon in the band. The edge of the photon energy band corresponds to the edge of the reflection spectrum of the cholesteric liquid crystal, so the edge of both sides of the reflection spectrum meets the conditions similar to the cavity. If the fluorescence spectrum of the dye overlaps with the reflection spectrum of the cholesteric liquid crystal, the burned light is reflected by the edge of the reflection spectrum to form a cavity, and the laser beam is formed along the spiral axis<br>