@article{oai:repo.qst.go.jp:00077691,
 author = {Kaneko, Yuto and Hayashi, Hidetaka and Ishii, Yasuyuki and Kada, Wataru and Nishikawa, Hiroyuki and Yasuyuki, Ishii},
 journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},
 month = {Nov},
 note = {We studied polydimethylsiloxane nanocomposites with oxides such as TiO2, SiO2, and Al2O3 aiming at proton beam writing (PBW) of buried optical waveguides. Relatively high transmission was achieved for 1.0 wt% TiO2/PDMS composite without aggregation. The refractive index can be tunable by varied TiO2 concentration in nanocomposites. We evaluated refractive index changes by 1.0 MeV proton irradiation. Refractive index of TiO2/PDMS nanocomposite increased at low fluence of less than 100 nC/mm2 and then decreased at higher fluence. On the other hand, we observed monotonic increase of the refractive index as a function of fluence for PDMS and PDMS nanocomposites with SiO2 and Al2O3. We also compared thermo optic effect of PDMS nanocomposites. We evaluated buried optical waveguides in TiO2/PDMS nanocomposite written by PBW for near field patterns with single mode waveguide.},
 pages = {94--97},
 title = {Refractive index change and thermo-optic effect in polydimethylsiloxane nanocomposites with oxide nanoparticles induced by proton beam writing},
 volume = {459},
 year = {2019}
}