Planar MMI couplers based on inorganic material platforms have played an essential role in photonic integrated circuits development. Advances in organic polymer fabrication techniques enable the design of components beyond a single plane, thus facilitating vertical integration for a wide range of components, including the MMI coupler. This paper presents the design of two 3D IP-dip polymer-based MMI power splitters operating in the near-infrared part of the spectrum at a wavelength of 1550 nm. The resulting output power ratio, modal field distributions, spectral characteristics, and the effects of input fibre misalignment are investigated using the beam propagation method. The fabrication method used to realise the designed splitters was direct laser writing. The function of the splitters was then verified by a highly resolved near-field scanning optical microscope.

In this paper, we present inverted pyramids patterned in the surface of IP-Dip polymer that can be used as a SERS substrate. Inverted pyramids are prepared using direct laser writing lithography and they are metal-coated in the next step. Prepared SERS structure consists of field of 40x40 pyramids with base of 3 μm and two depths – 2 and 3 μm. Afterwards, an Au layer with 4 different thicknesses (10 nm, 20 nm, 30 nm and 40 nm) is evaporated. Transmission spectra were simulated and measured for characterization of prepared structures. The micro-Raman measurements using Rhodamine 6G in aqueous solution at concentration of 10-2 M as the probe molecule were performed.