Research on Broadening Band Gaps of Two Dimensional Holographic Photonic Crystals

In this thesis,the author proposed a simple approach to fabricating 2-D holographic photonic crystal with large band-gaps,and have discussed the factors that influence on broadening the band-gaps.It was found that a unexpected diffracted peak is always accompany the designed and expected peaks.Also,one of the expected peaks will disappear if incident angle during recording is larger than a critical value.On the other hand,the extra diffraction peak will enlarge the band-gap if incident angle is less than a certain value,but when angle is larger than the certain value,one of the expected main peaks will disappear,and the band-gap will get narrow instead.This phenomenon is guidable for fabrication of 2-D holographic photonic crystals with broadened band-gap.