We introduce an inverted refractive-index-contrast grating (ICG) that is a compact alternative to DBRs. In ICG a subwavelength grating made of a low refractive index material is implemented on a high refractive index cladding. We experimentally demonstrate high reflectivity of proof-of-concept ICG fabricated by 3D microprinting, in which IP-Dip photoresist grating is deposited on silicon cladding. We also show that the ICG provides nearly total optical power reflectance whenever the refractive index of the grating exceeds 1.75, irrespective of the refractive index of the cladding.
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.
Conference Committee Involvement (1)
Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
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