Photonic band-gap formation and critical state in 3-d photonic quasicrystals

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03572
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: The University of Tokyo
• Principal Investigator: Edagawa Keiichi 東京大学, 生産技術研究所, 教授 (20223654)
• Co-Investigator(Renkei-kenkyūsha): Kamimura Yasushi 東京大学, 生産技術研究所, 助教 (40291314)
• Research Collaborator: Kawamata Yuta ; Fujikawa Hiroyasu ; Suzuki Takanori ; Ida Keisuke 東京大学, 大学院工学系研究科, 大学院生 ; Komiyama Yuichiro 東京理科大学, 大学院基礎工学研究科, 大学院生
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: フォトニック結晶 / フォトニックバンドギャップ / 準結晶 / 臨界状態 / 光状態密度

Outline of Final Research Achievements

Though the existence of peculiar type of electronic states named “critical states” has been theoretically predicted in quasicrystals (QCs), it has never been demonstrated clearly. The first purpose of this study is to demonstrate the existence of the critical states in a photonic system, using “photonic QCs”. Here, we have successfully shown the formation of photonic critical states by investigating system-size dependence of “participation” using an FDTD electromagnetic-field simulation.
Researches are in progress, aiming at the development of minute light-controlling devices and furthermore photonic integrated circuits utilizing the light-confining effect by photonic bandgaps (PBG) of photonic crystals. The second purpose of this study is to develop photonic crystals that exhibit a larger PBG than conventional photonic crystals utilizing the peculiar structural order of QCs. It is shown that photonic QCs are advantageous in the formation of PBG in a low refractive-index region.

Free Research Field

材料科学