@article{weko_10406_1,
   author	 = "TOMIOKA,Shun and IGUCHI,Akito and TSUJI,Yasuhide",
   title	 = "Function-expansion-based topology optimization of three-dimensional optical waveguide devices with multi-layered structure considering layer thickness",
   journal	 = "OPTICS COMMUNICATIONS",
   year 	 = "2020",
   volume	 = "474",
   number	 = ""
}