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Strong circular dichroism for the HE11 mode in twisted single-ring hollow-core photonic crystal fiber
Optica ( IF 10.4 ) Pub Date : 2018-10-18 , DOI: 10.1364/optica.5.001315
P. Roth , Y. Chen , M. C. Günendi , R. Beravat , N. N. Edavalath , M. H. Frosz , G. Ahmed , G. K. L. Wong , P. St. J. Russell

We report a series of experimental, analytical, and numerical studies demonstrating strong circular dichroism for the HE11-like core mode 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 nontouching capillaries. Coupling between these capillaries results in the formation of helical Bloch modes carrying orbital angular momentum. When twisted, strong circular birefringence appears in the ring, so that coupling to the core mode is possible for only one circular polarization state. The result is a SR-PCF that acts as a circular polarizer, offering 1.4 dB/m for the low-loss polarization state and 9.7 dB/m for the high-loss state over a 25 nm band centered at 1593 nm wavelength. In addition, we report for the first time that the vector fields of the helical Bloch modes are perfectly periodic when evaluated in cylindrical coordinates. Such fibers have many potential applications, such as generating circularly polarized light in gas-filled SR-PCF and realizing polarizing elements in the deep and vacuum ultraviolet.

中文翻译:

扭曲单环空心光子晶体光纤中HE 11模式的强圆二色性

我们报告了一系列的实验,分析和数值研究,这些结果证明了强圆二色性 11螺旋扭曲的空心单环光子晶体光纤(SR-PCF)中的类芯模式,是通过在光纤拉伸过程中旋转预成型件而形成的。在所研究的SR-PCF中,空心被单个非接触毛细管环包围。这些毛细管之间的耦合导致形成携带轨道角动量的螺旋Bloch模式。扭曲时,圆环中会出现强圆形双折射,因此仅对于一种圆偏振态,可能会耦合到纤芯模式。结果是SR-PCF充当圆偏振器,在以1593 nm波长为中心的25 nm波段上,低损耗偏振态提供1.4 dB / m,高损耗态提供9.7 dB / m。此外,我们首次报告,在圆柱坐标系中评估时,螺旋Bloch模式的向量场具有完美的周期性。这样的纤维具有许多潜在的应用,例如在充气的SR-PCF中产生圆偏振光,并在深紫外和真空紫外中实现偏振元件。
更新日期:2018-10-19
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