• Citer

Mitigation of photon background in nanoplasmonic all-on-chip Raman sensors

par Reynkens, Kristof;Clemmen, Stéphane ;Raza, Ali;Zhao, Haolan;Peñaranda, Juan Santo-Domingo;Detavernier, Christophe;Baets, Roel
Référence Optics express, 28, 22, page (33564)
Publication Publié, 2020-10-26

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

In the quest for a more compact and cheaper Raman sensor, photonic integration and plasmonic enhancement are central. Nanoplasmonic slot waveguides exhibit the benefits of SERS substrates while being compatible with photonic integration and mass-scale (CMOS) fabrication. A difficulty in pursuing further integration of the Raman sensor with lasers, spectral filters, spectrometers and interconnecting waveguides lies in the presence of a photon background generated by the excitation laser field in any dielectric waveguide constituting those elements. Here, we show this problem can be mitigated by using a multi-mode interferometer and a nanoplasmonic slot waveguide operated in back-reflection to greatly suppress the excitation field behind the sensor while inducing very little photon background.