扭曲单环空芯光子晶体光纤中的强圆二色性
Strong circular dichroism in twisted single-ring hollow-core photonic crystal fiber
摘要：
我们报告了一系列的实验，分析和数值研究表明，在螺旋扭曲的空芯单环光子晶体光纤（SR-PCF），形成在光纤拉伸过程中的预制件旋转的强圆二色性。在所研究的SR-PCF中，空芯被非接触毛细管的单环包围。这些毛细管之间的耦合导致携带轨道角动量的螺旋布洛赫模式的形成。在扭转光纤中，强圆双折射出现在环中，使得当具有特定圆偏振态（例如LC）的芯模与环相位匹配时，另一个（RC）被强烈地退相。此外，如果核和环中的轨道角动量相同，并且偏振态是非正交的（例如，稍微椭圆形），则LC芯模将经历高损耗，而RC模被有效地传输。结果是单圆偏振SR-PCF，其在一定波长范围内充当圆偏振器。这种光纤具有许多潜在的应用，例如，在充气SR-PCF中产生圆偏振光，以及在深紫外和真空紫外中实现偏振元件。
英文摘要：
We report a series of experimental, analytical and numerical studies demonstrating strong circular dichroism in helically twisted hollow-core single-ring photonic crystal fiber (SR-PCF), formed by spinning the preform during fiber drawing. In the SR-PCFs studied, the hollow core is surrounded by a single ring of non-touching capillaries. Coupling between these capillaries results in the formation of helical Bloch modes carrying orbital angular momentum. In the twisted fiber, strong circular birefringence appears in the ring, so that when a core mode with a certain circular polarization state (say LC) phase-matches to the ring, the other (RC) is strongly dephased. If in addition the orbital angular momentum is the same in core and ring, and the polarization states are non-orthogonal (e.g., slightly elliptical), the LC core mode will experience high loss while the RC mode is efficiently transmitted. The result is a single-circular-polarization SR-PCF that acts as a circular polarizer over a certain wavelength range. Such fibers have many potential applications, for example, for generating circularly polarized light in gas-filled SR-PCF and realizing polarizing elements in the deep and vacuum ultraviolet.
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