| 研究課題/領域番号 |
16K17525
|
|---|
| 研究機関 | 筑波大学 |
|---|
研究代表者 |
You Borwen (游博文) 筑波大学, 数理物質系, 助教 (90760736)
|
|---|
| 研究期間 (年度) |
2016-04-01 – 2019-03-31
|
| キーワード | Photonic crystals / Integrated waveguides / Terahertz waves / Spectroscopy |
|---|
| 研究実績の概要 |
Terahertz (THz) waves laterally confined in a 1 mm-thick microstructured planar waveguide are demonstrated on a free-standing metal rod array (MRA). The visibility of the photonic bandgap in the spectral width and power distinction can be manipulated by changing the MRA geometry parameters, including the rod diameter, the interspace between adjacent rods, and the propagation length based on interactive MRA-layer number. THz transmission ratio enhanced by a large interactive length is verified in 30 MRA layers due to the longitudinally resonant guidance of transverse-magnetic-polarized waveguide modes along the MRA length, which is critical to the interspace width of adjacent rods and the metal coating of the rod surface. For an MRA with respective rod diameter and interspace dimensions of about 0.16 and 0.26 mm, the highest transmission of the guided resonant THz waves are performed at 0.505~0.512 THz frequency with strong confinement on the metal rod tips and a low scattering loss of 0.003/cm.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Integrated Terahertz (THz) waveguide sensors based on metal-rod-arrays (MRAs) have been experimentally demonstrated for sensing nano-thin films and liquid drops, respectively based on transverse-magnetic (TM) and transverse-electric (TE) polarized wave transmissions. The MRA-guided THz field is phase-sensitive to the analytes both in the TM- and TE-waveguide modes, and the highly sensitive detection of nano-films or liquid drops can be achieved while the waveguide modal field is spatially controlled to match the cross sections of the analytes. This sensing scheme for the MRA waveguide demonstrates the advantages in using the evanescent waveguide field on a miniature chip system. Such investigation results are thus complete for this project purpose and positive for other advanced topics.
|
| 今後の研究の推進方策 |
The project entitled, development of three-dimensional terahertz(THz) photonic chip for molecular sensing, shows the metal-rod-array (MRA) microstructure is advantageous to construct a THz photonic chip for the molecular sensing. However, several issues are found in this development (2016 ~ 2017): (1) the geometry criteria to approach one MRA-based plasmonic waveguide in THz frequency region. (2) Characterization of THz field performances in propagation and resonance between 2D and 3D photonic structures. Based on these two issues, the project will clarify the methods for the novel THz-chip sensors, breaking through the using concepts of traditional THz-spectroscopic system and their applications. We have submitted our study results in the coming international conferences of 2018.
|
