Refractive index grating fabrication

Refractive Index Grating Fabrication into Azo-Dye-Functionalised Poiymer Waveguides... 

Hattori, X, Shibata, X, Onodera, S., and Kaino, X Fabrication of refractive index grating into azo-dye-containing polymer films by irreversible photoinduced bleaching. /.. 4pp/. Phys. 2000, 87, pp. 3240-3244. 

There are many potential applications of such 3D polymer nanostructures. Multilayered structure with varied grating periods can be used as size-controlled filters in microfluidics to select and separate particles of different sizes. Another potential application is to fabricate periodic 3D polymer structures and infiltrate the polymer template with high refractive index inorganic... 

Vasiliev S, Medvedkov O (2000) Long period refractive index fiber gratings properties, applications, and fabrication techniques. Proc SPIE 4082 212-223... 

Fig. 5.11. (a) Spin-coated polymer 1 films (40-80 nm thick, with refractive index (n 1.70) are coated on a transparent 200-nm-thick film of chemical vapor deposited parylene (n 1-67), forming a two-layer index-matched waveguide on glass (n 1.45). (b) Spin-coated polymer 1 films (40nm) coated on DFB gratings fabricated from PDMS. (c) Ring-mode laser structure produced by dip-coating polymer 1 on a 25 mm diameter silica optical fiber... 

Femtosecond pulsed lasers have been used to manufacture photonic devices (splitters, interferometers, etc.) and gratings. An ultrafast-laser driven micro-explosion method using a tightly focused femtosecond laser was exploited to fabricate three-dimensional (3D) void-based diamond lattice photonic crystals in a low refractive index polymer material (solid resin) [62]. 

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