2013 Fiscal Year Final Research Report
Low-noise quantum cascade lasers and optical antenna probe for near-field Raman spectroscopy
| Project/Area Number |
23560043
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Applied optics/Quantum optical engineering
|
|---|
| Research Institution | Ritsumeikan University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Keywords | 量子カスケードレーザ / 光アンテナ / 中赤外 / 近接場 / ラマン分光 |
|---|
| Research Abstract |
The influence of external feedback on the relative intensity noise of a mid-infrared InGaAs/InAlAs distributed-feedback-quantum cascade lasers was quantitatively clarified for the first time. Next, towards the development of optical antenna probes, mid-infrared optical antennas were fabricated on a Si substrate. The FDTD method can calculate the electric field around an optical antenna, but it is not easy to experimentally discern its distribution normal to the antenna surface. So, a thin Al2O3 layer was deposited on a Si substrate through atomic layer deposition, and dumbbell-shaped slot antennas were made on this substrate. It was possible to grow a layer with the thickness being controlled to an accuracy of ~1 nm. By observing the change in the restrahlen reflection spectras, an understanding of the vertical field distribution could be gained. Obtained results are effective in achieving photo-detectors satisfying both high-sensitivity and high-speed in the mid-infrared range.
|
