Optical properties of one-dimensional photonic crystal containing dispersive and active medium
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摘要: 为了理解光子晶体微腔的光学传输特性,探讨微腔的折射率对缺陷模放大特性和谐振频率的影响,采用时域有限差分法计算了含洛伦兹色散介质一维光子晶体微腔的透射谱,分析、比较了不同光子晶体微腔的透射谱。结果表明,微腔折射率的大小决定缺陷模的谐振频率,而介质色散特性将导致缺陷模频率的移动。另外,当通过复介电常数的虚部引入光学增益后,缺陷模在增益介质中被放大,其阈值特性和缺陷折射率的大小密切相关。模拟结果证明通过合理的选择微腔中介质折射率的大小,可以改善微腔的光学特性,降低激光器的阈值。Abstract: For well understanding of light propagation in photonic crystal micro-cavity,the transmission spectrum of a one-dimensional photonic crystal contained Lorentz dispersive medium was calculated by means of the finite-difference time-domain method.The influence of refractive index inside micro-cavity on amplification properties and resonant frequency of defect modes was analyzed in detail.The results show that dispersive properties inside the micro-cavity lead to frequency shift of the defect modes.In addition,these defect modes can be also amplified as optical gain is introduced into the system.It is shown that lasing threshold of the defect modes can be significantly reduced through carefully adjusting the refractive index of micro-cavity.
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Keywords:
- laser optics /
- photonic crystal /
- finite-difference time-domain method /
- threshold
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