Abstract
We present a simple and highly sensitive cantileverenhanced photo-acoustic sensor for detection of nitrogen dioxide. A noise equivalent detection limit of 50 parts-per-trillion in 1 s is demonstrated. The limit was reached with an average optical power of 4.7 W using a continuous-wave laser at 532 nm. The achieved normalized noise equivalent absorption coefficient was 2.6 × 10-10 W cm-1 Hz-1/2.
| Original language | English |
|---|---|
| Pages (from-to) | 2933-2936 |
| Journal | Optics Letters |
| Volume | 40 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 2015 |
| MoE publication type | A1 Journal article-refereed |