The paper shows concepts of optical splitting based on three dimensional (3D) optical splitters based on multimode interference principle. This paper is focused on the design, fabrication and characterization of 3D MMI splitter with formed output waveguides based on IP-Dip polymer for direct application on optical fiber. The MMI optical splitter was simulated and fabricated using direct laser writing process. Output characteristics were characterized by highly resolved near-field scanning optical microscope (NSOM) and compared with 3D MMI splitter without output waveguides.
This paper describes an idea of creating a liquid analyte sensor based on a one-dimensional (1D) photonic crystal - dielectric mirror - integrated on the optical fiber end face and creating a resonant cavity with the reversed structure. This geometry produces the evident resonances within the photonic band gap spectral region which are sensitive to refractive index changes inside the resonant cavity. The main idea is to use this arrangement as a sensor in Lab-on-a-chip (LOC) device with two single mode optical fibers (SMFs). An inlet and outlet is proposed for different liquid analyte delivery and in-situ monitoring of the refractive index change of the analyte.
We proposed, simulated and fabricated a new type of three-dimensional (3D) optical splitter based on multimode interference (MMI). Splitter was designed for the wavelength of 1550 nm and the input signal is divided into 9 outputs. The multimode waveguide part of the splitter was designed as a block with square basis of cross-section of 26 x 26 μm2 and length of 211 μm. We used the IP-Dip polymer as a standard material for 3D laser lithography. We present the design, simulated and measured optical field distribution in the output of the MMI splitter and its direct integration on the single mode optical fiber.
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