2020 Fiscal Year Final Research Report
Fabrication of metal nano helices towards the ultimate control of chirality of photons
| Project/Area Number |
19K15454
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 30010:Crystal engineering-related
|
|---|
| Research Institution | National Institute of Advanced Industrial Science and Technology (2020)
Institute of Physical and Chemical Research (2019) |
|---|
Principal Investigator |
Le ThuHacHuong 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 産総研特別研究員 (60752144)
|
|---|
| Project Period (FY) |
2019-04-01 – 2021-03-31
|
| Keywords | キラルメタマテリアル / 螺旋ナノ構造 / 光のキラリティーの制御 |
|---|
| Outline of Final Research Achievements |
Controlling the chirality of photon by using chiral metamaterials enables a number of unprecedented applications from integrated photonics to life science. Among the chiral metamaterials developed so far, helical structures are expected to exhibit very high optical chirality over a large volume. However, fabricating helices with responses at optical frequencies is still very challenging, since structures must have geometrical features comparable with the wavelength of interest. Here, we proposed a novel method to fabricate helices by exploiting the stress-driven self-folding of metal thin film, and demonstrated helical structures of ~100 nm in diameters. The plasmon resonance and chiro-optical effects in the near- and mid-IR range have been observed. The greatest advantage of our technique is that the helices can be formed directly from two-dimensional structures through a programmable self-assembly process. Our method pave the way towards the exploration of chiral photonic devices.
|
| Free Research Field |
光工学
|
| Academic Significance and Societal Importance of the Research Achievements |
開発した手法は従来のトップダウン型ナノ加工技術で作製された平面構造を立体的螺旋状構造体に自己変形させる，自己形成的なプロセスでありながらも，メタマテリアルの動作波長を決める螺旋構造の寸法（直径やピッチ，螺旋ステップ数等）と光のキラリティー制御性能を決める螺旋構造の周期・配列・配向を精密に制御できる全く新しい立体構造加工技術である．特に光帯域で作動する螺旋構造及び巨大なキラルリティーを持つ近接場の実現は，新たな分光分析法技術や新妙な光学素子・光情報プロセシング技術の開拓に繋げると期待できる．また大面積に亘り高速かつ低コストでの加工できる点においても産業展開に大きな意義をなす．
|
