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    • 6. 发明授权
    • Guided resonance dielectric filter systems
    • 引导谐振介质滤波系统
    • US07142364B2
    • 2006-11-28
    • US10936837
    • 2004-09-08
    • Wonjoo SuhOlav SolgaardShanhui Fan
    • Wonjoo SuhOlav SolgaardShanhui Fan
    • G02B1/10
    • B82Y20/00G02B6/1225
    • We theoretically introduce a new type of optical all-pass filter based on guided resonance in coupled photonic crystal slabs. The filter exhibits near-complete transmission for both on- and off-resonant frequencies and yet generates large resonant group delay. We further show that such a filter can be mechanically switched into a flat-top band rejection filter. We also show that a single photonic crystal slab can also function either as optical all-pass transmission or flattop reflection filter for normally incident light. Both filter functions are synthesized by designing the spectral properties of guided resonance in the slab. The structure is extremely compact along the vertical direction.
    • 我们理论上引入了一种基于耦合光子晶体板中的引导谐振的新型光学全通滤波器。 滤波器对于开启和关闭谐振频率都表现出近乎完整的传输,并且产生大的谐振群延迟。 我们进一步表明,这种滤波器可以机械地切换成平顶带阻滤波器。 我们还表明,单个光子晶体板也可以作为普通入射光的光学全透镜或平面反射滤光片。 通过设计板坯中引导共振的光谱特性来合成滤波器功能。 该结构沿垂直方向非常紧凑。
    • 8. 发明授权
    • Ultra-slow down and storage of light pulses, and altering of pulse spectrum
    • 光脉冲的超慢减速和脉冲光谱的改变
    • US07269313B2
    • 2007-09-11
    • US11001492
    • 2004-11-30
    • Mehmet Fatih YanikShanhui Fan
    • Mehmet Fatih YanikShanhui Fan
    • G02B6/26G02F1/295
    • B82Y20/00G02B6/1225
    • Light pulses can be stopped and stored coherently, with an all-optical process that involves an adiabatic and reversible pulse bandwidth compression occurring entirely in the optical domain. Such a process overcomes the fundamental bandwidth-delay constraint in optics, and can generate arbitrarily small group velocities for light pulses with a given bandwidth, without the use of any coherent or resonant light-matter interactions. This is accomplished only by small refractive index modulations performed at moderate speeds and has applications ranging from quantum communications and computing to coherent all-optical memory devices. A complete time reversal and/or temporal/spectral compression and expansion operation on any electromagnetic field is accomplished using only small refractive index modulations and linear optical elements. This process does not require any nonlinear multi-photon processes such as four-wave mixing and thus can be implemented using on-chip tunable microcavity complexes in photonic crystals. The tuning process requires only small refractive index modulations, and moderate modulation speeds without requiring any high-speed electronic sampling.
    • 光脉冲可以被停止并相干地存储,其全光学过程涉及完全在光学域中发生的绝热和可逆的脉冲带宽压缩。 这种过程克服了光学中的基本带宽延迟约束,并且可以为具有给定带宽的光脉冲产生任意小的组速度,而不使用任何相干或共振的光物质相互作用。 这仅通过在中等速度下执行的小折射率调制来实现,并且具有从量子通信和计算到相干全光存储器件的应用。 在任何电磁场上的完全时间反转和/或时间/频谱压缩和扩展操作仅使用小的折射率调制和线性光学元件来实现。 该过程不需要诸如四波混频的任何非线性多光子过程,因此可以使用光子晶体中的片上可调谐微腔复合体来实现。 调谐过程只需要较小的折射率调制和适度的调制速度,而不需要任何高速电子采样。