| Autor: |
Gotardo F, Carey BJ, Greenall H, Harris GI, Romero E, Bulla D, Bridge EM, Bennett JS, Foster S, Bowen WP |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2023 Nov 06; Vol. 31 (23), pp. 37663-37672. |
| DOI: |
10.1364/OE.501960 |
| Abstrakt: |
Optomechanical magnetometers enable highly sensitive magnetic field sensing. However, all such magnetometers to date have been optically excited and read-out either via free space or a tapered optical fiber. This limits their scalability and integrability, and ultimately their range of applications. Here, we present an optomechanical magnetometer that is excited and read-out via a suspended optical waveguide fabricated on the same silicon chip as the magnetometer. Moreover, we demonstrate that thermomechanical noise limited sensitivity is possible using portable electronics and laser. The magnetometer employs a silica microdisk resonator selectively sputtered with a magnetostrictive film of galfenol (FeGa) which induces a resonant frequency shift in response to an external magnetic field. Experimental results reveal the retention of high quality-factor optical whispering gallery mode resonances whilst also demonstrating high sensitivity and dynamic range in ambient conditions. The use of off-the-shelf portable electronics without compromising sensor performance demonstrates promise for applications. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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