Optical and structural characterisation of single and multilayer germanium/silicon monoxide systems

Planar Quarter Wave Stack Reflectors Prepared from Chalcogenide Ge-Se and Polymer Polystyrene Thin Films

“…In our opinion, this value can be further reduced maximally up to the level of 1-2% especially if we consider that the main issue remains the thickness homogeneity of spin-coated films across their entire surface. For comparison, the inaccuracy in thickness for crystalline films prepared using more sophisticated and more expensive vacuum deposition methods such as an e-beam or CVD is under 1% (Yao et al, 2007 andPerez et al, 2005). In case of 1D-photonic crystals, i.e., multilayers a film thickness inaccuracy in order of percent units has basically a low impact on the optical properties of such multilayers.…”

All-chalcogenide middle infrared dielectric reflector and filter

“…-OH, -CH x , -NH x , -CN groups etc. The middle-infrared QWS devices could be made from multilayers based on Ge/SiO x films designed for night vision band λ =3-5 μm [11], Te/Polystyrene system used for laser band λ = 8-12 μm [12] or crystalline halides and chalcogenides, i.e., YF 3 /ZnS multilayers with meteorology applications in λ =3-16 μm range [13] and CdTe, HgTe systems used for far infrared wavelengths λ =15-70 μm (applications in astronomy) [14]. Chalcogenide bulk glasses and thin films [15] are well known as materials having high transparency in the infrared range of λ =0.5-20 μm depending on chalcogenide composition, see Fig.…”

Planar chalcogenide quarter wave stack filter for near-infrared

“…Hence, various dielectric materials [7][8][9][10][11] and deposition techniques have been already studied as potential candidates for fabrication of low loss QWS optical elements with tailored bandgaps for the specific frequency regions. Among studied materials and structures, chalcogenide/polymer [12][13][14][15] planar or scrolled dielectric multilayers have also demonstrated interesting optical properties and application potential.…”