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A thermo-optically tunable polarization beam splitter (PBS) is proposed and numerically studied. The proposed structure is based on a selectively gold-filled dual-core photonic crystal fiber (DC-PCF), which has two internal electrodes for thermo-optical tuning of the operating band of the PBS. A full-vector finite element method is used to analyze the behavior of the main parameters of the proposed device, such as coupling length, coupling length ratio, propagation distance and extinction ratio. Numerical results show that with a small length of 1.890 mm, the coupling length for the two polarization states is not modified in the analyzed temperature range. In addition, the splitter exhibits a coupling length ratio of approximately 1.5 with slightly changes as the temperature increases. The proposed PBS presents a bandwidth of 9 nm, a high extinction ratio of − 83.2 dB and tuning sensitivities of − 67 and 66 pm/ ∘ C when the internal electrodes are arranged horizontally and vertically, respectively. The DC-PCF based platform with internal electrodes has remarkable advantage such as ease of implementation and high tuning sensitivity, which ensures its potential applications in compact optical systems, optical switching and sensing applications. [ABSTRACT FROM AUTHOR]

A photovoltaic effect has been discovered at a contact between a semiconductor and biological origin materials. Photoelectrical properties of the new type structures have been investigated. Structures consisting of a semiconductor and materials of biological origin can be used as photovoltaic converters for natural and linearly polarized light. It needs for information transmission over distances, as well as for analysis of the polarization state of the laser radiation in communication systems. [ABSTRACT FROM AUTHOR]