OPTICAL WAVEGUIDE AND OPTICAL CONCENTRATION MEASURING DEVICE

• Main Authors: FURUYA TAKAAKI, YAGI TATESHI
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To increase the exuding efficiency of an evanescent wave of a propagation light and the input/output efficiency of light.SOLUTION: An optical waveguide 10 has a core layer 11 capable of propagating light. The core layer 11 has a first part 11a, a second part 11b, a third part 11c, a fourth part 11d, and a fifth part 11e. The first part 11a has a first film thickness. The second part 11b has a second film thickness smaller than the first film thickness. The third part 11c has a third film thickness equal to or smaller than the second film thickness. The fourth part 11d connects the first part 11a and the second part 11b to each other. The fifth part 11e connects the second part 11b and the third part 11c to each other. The first part 11a has a diffraction grating part. The second part 11b and the third part 11c have a light propagation part.SELECTED DRAWING: Figure 1 【課題】伝搬光のエバネッセント波の染出し効率および光の入出力効率の向上を図る。【解決手段】光導波路１０は光を伝搬可能なコア層１１を有する。コア層１１は第一部分１１ａと第二部分１１ｂと第三部分１１ｃと第四部分１１ｄと第五部分１１ｅとを有する。第一部分１１ａは第一膜厚を有する。第二部分１１ｂは第一膜厚未満の第二膜厚を有する。第三部分１１ｃは第二膜厚以下の第三膜厚を有する。第四部分１１ｄは第一部分１１ａと第二部分１１ｂとの間を接続する。第五部分１１ｅは第二部分１１ｂと第三部分１１ｃとの間を接続する。第一部分１１ａは回折格子部を有する。第二部分１１ｂおよび第三部分１１ｃは光伝搬部を有する。【選択図】図１