Low-loss materials for high Q-factor Bragg reflector resonators
Low-loss materials for high Q-factor Bragg reflector resonators
复制标题
用于高 Q 因子布拉格反射谐振器的低损耗材料
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Krupka
中科院分区：
文献类型：
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作者：
J. L. Floch;Michael E.Tobar;D. Cros;J. Krupka
布拉格谐振器使用金属腔内的介电板将能量限制在中心自由空间区域内。介电常数的重要性表明，使用具有较大本征介电损耗的高介电常数材料可以获得更好的Q因子。这是因为反射器中的电能与介电常数的平方根成比例地减少，与金属损耗的耦合线性地减少。在具有单反射器对的蓝宝石谐振器中，可以获得Q因子2.34×105，使用更高介电常数的材料可以将Q因子提高到2倍。
A Bragg resonator uses dielectric plates within a metallic cavity to confine the energy within a central free space region. The importance of the permittivity is shown with a better Q factor possible using higher permittivity materials of larger intrinsic dielectric losses. This is because the electric energy in the reflectors decreases proportionally to the square root of permittivity and the coupling to the metallic losses decrease linearly. In a sapphire resonator with a single reflector pair a Q factor of 2.34×105 is obtained, which may be improved on by up to a factor of 2 using higher permittivity materials.