基于宽度抛物线型和渐变孔径的超高Q低V一维光子晶体纳米梁腔的设计
Ultrahigh-Q small-V photonic crystal nanobeam cavities based on parabolic-shaped width and taper holes
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摘要: 设计了基于宽度抛物线型和孔径渐变的一维(1-D)光子晶体(PhC)纳米梁腔.通过FDTD的计算模拟,设计的这种纳米梁腔可以实现超高Q值1.8×10~7,同时拥有超小模体积V~0.04(λ/n)~3,在继承抛物线型和渐变孔径型纳米梁腔高Q的基础上,进一步降低了模体积V.我们设计的这种腔具有紧凑,低制造工艺要求以及高Q/V值等优点,在未来应有广泛应用.Abstract: One-dimensional (l-D) photonic crystal (PhC) nanobeam cavity based on parabolic-shaped width and tapered holes was proposed and analyzed. Finite-difference time-domain simulations show that both an ultrasmall modal volume (V - 0.04(λ/n)3) and ultrahigh quality factor (Q -1.8 x 10^7) can be obtained in PT PhC nanobeam cavity. In addition, the PT PhC nanobeam have one order lower V comparing to parabolic and tapered nanobeam. With compactness, lower fabrication requirements to achieve ultrahigh Q/V, the proposed nanobeam could be versatile platforms of interest for optical communications, optomechanics, cavity QED, etc.
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