In this paper an on-chip device capable of wavelength-selective generation of vortex beams is demonstrated. The device is realized by integrating a spiral phase-plate onto a MEMS tunable Fabry-Perot filter. This vortex-MEMS filter, being capable of functioning simultaneously in wavelength and orbital angular momentum (OAM) domains at around 1550 nm, is considered as a compact, robust and cost-effective solution for simultaneous OAM- and WDM optical communications. Experimental spectra for azimuthal orders 1, 2 and 3 show OAM state purity >92% across 30 nm wavelength range. A demonstration of multi-channel transmission is carried out as a proof of concept.
Sujoy Paul, Vladimir S. Lyubopytov, Martin F. Schumann, Julijan Cesar, Mohammadreza Malekizandi, Mohammad T. Haidar, Alexei P. Porfirev, Stanislav O. Gurbatov, Martin Wegener, Arkadi Chipouline, and Franko Küppers, "Vortex-MEMS filters for wavelength-selective orbital-angular-momentum beam generation," Proc. SPIE 10120, Complex Light and Optical Forces XI, 101200G (Presented at SPIE OPTO: February 01, 2017; Published: 27 February 2017); https://doi.org/10.1117/12.2252494.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon