Simultaneous Detection of Modal Composition and Wavelength of OAM Fields Using a Hexagonal Vortex Filter

A. Reddy, V. Anand, V. Podlipnov, S. Khonina, S. Juodkazis
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Abstract

The present study investigated the possibilities of transmitting information using different wavelengths (Near-IR) and different orbital angular momentum (OAM) modes simultaneously and applying modal decomposition using a passive hexagonal vortex filter (HVF) fabricated using a lithography procedure. The HVF was designed by a modulo-$2 \pi$ phase addition of helical phases with three different orders (1, 2, and 3) with unique linear-phase functions in a hexagonal formation (0, $\pi /4$ and $-\pi /4)$. When a light field composed of multiple OAM modes is incident on the HVF, they are spatially mapped to unique lateral locations in the detector plane. Any change in OAM mode will result in a variation in the intensity distribution at the different locations but no change in the lateral mapping locations. However, when there is a change in wavelength, the linear phase varies and maps the modes at different lateral locations from the center of the detector. In this way, it is possible to measure the modal composition of the light field and its wavelength simultaneously and independently. We believe that the proposed approach will introduce a new and efficient dimension — wavelength, for free-space optical communication (FSOC) applications resulting in enhancement of information bandwidth.
利用六边形涡旋滤波器同时检测OAM场的模态组成和波长
本研究探讨了利用不同波长(近红外)和不同轨道角动量(OAM)模式同时传输信息的可能性,并利用光刻工艺制造的被动六边形涡旋滤波器(HVF)进行模态分解。HVF是通过对三阶螺旋相(1、2和3)进行模-$2 \pi$相位加法来设计的,这些螺旋相具有独特的六边形线性相位函数(0、$\pi /4$和$-\pi /4)$。当一个由多个OAM模式组成的光场入射到HVF上时,它们在空间上被映射到探测器平面上唯一的横向位置。OAM模式的任何变化都会导致不同位置的强度分布发生变化,但横向测图位置不会发生变化。然而,当波长发生变化时,线性相位发生变化,并映射出从探测器中心到不同横向位置的模式。这样,就可以同时独立地测量光场及其波长的模态组成。我们相信该方法将为自由空间光通信(FSOC)应用引入一种新的有效维度-波长,从而提高信息带宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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