Multi wavelength measuring of the gold nanoparticles by the optical fiber interferometer

Agrež, Vid (avtor), Kramar, Julij (avtor), Petkovšek, Rok (avtor)

An optical fiber-based Mach–Zehnder interferometer was developed for photothermal detection of gold nanoparticles in aqueous suspensions. The excitation laser locally heats the suspension, inducing a refractive index change that is detected as a phase shift in the interferometer's measuring arm. By employing excitation wavelengths of 450 nm and 525 nm, the wavelength-dependent absorption was analyzed and compared to Mie theory predictions, enabling simultaneous determination of particle size and concentration. The absorption cross-section ratio, calculated from measurements at both wavelengths, depends only on particle size and provides the basis for size determination without prior knowledge of concentration. The system demonstrated high sensitivity, with detection limits as low as 8 × 10⁶ particles per milliliter for 100 nm gold nanoparticles. The optical fiber-based architecture offers simplicity, robustness, and potential for integration into portable sensing systems for nanoparticle characterization and biosensing applications.

• Jezik: Angleški jezik
• Ključne besede: optical fiber interferometer, photothermal detection, gold nanoparticles
• Vrsta gradiva: Bibliografija
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 7 str.
• Številčenje: Vol. 408, art. 118046
• PID: 20.500.12556/RUL-182960
• UDK: 620.3
• ISSN pri članku: 1873-3069
• DOI: 10.1016/j.sna.2026.118046
• COBISS.SI-ID: 279851267
• Datum objave v RUL: 29.05.2026

Gradivo je del revije

• Naslov: Sensors and actuators : Physical
• Založnik: Elsevier
• ISSN: 1873-3069
• COBISS.SI-ID: 23273477

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: vlakenski interferometer, fototermalna detekcija, zlati nanodelci

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0270
• Naslov: Proizvodni sistemi, laserske tehnologije in spajanje materialov

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: L2-4485
• Naslov: Merjenje absorpcije črnega ogljika s sistemom na osnovi optičnih vlaken