Nanoparticles sensing and imaging with free-space excited whispering gallery mode microresonators

Davide D'Ambrosio; Gianluca Gagliardi; Pietro Malara; Antonio Giorgini; Marialuisa Capezzuto; Saverio Avino; Xavier Zambrana Puyalto

doi:10.1117/12.2621297

17 May 2022 Nanoparticles sensing and imaging with free-space excited whispering gallery mode microresonators

Davide D'Ambrosio, Gianluca Gagliardi, Pietro Malara, Antonio Giorgini, Marialuisa Capezzuto, Saverio Avino, Xavier Zambrana Puyalto

Author Affiliations +

Proceedings Volume 12139, Optical Sensing and Detection VII; 121390D (2022) https://doi.org/10.1117/12.2621297
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We present a new method for detecting single nanoparticles using a sensor based on a whispering gallery mode resonator submerged in aqueous solutions. A free-space diode laser excites whispering-gallery mode resonances by focusing it on the edge of the microresonator. Its emission frequency is then locked to a resonant mode in order to track any change induced by the interaction of the microsphere with nanoparticles, which can be suspended in the surrounding liquid medium. A theoretical analysis based on some seminal work, together with preliminary noise source evaluation, indicates that frequency shifts down to the order of hundreds of kHz are measurable, thus allowing to detect single nanoparticles. Further upgrades of the experimental scheme aimed at precise nanoparticle sizing and positioning are discussed.

Conference Presentation

Citation Download Citation

Davide D'Ambrosio, Gianluca Gagliardi, Pietro Malara, Antonio Giorgini, Marialuisa Capezzuto, Saverio Avino, and Xavier Zambrana Puyalto "Nanoparticles sensing and imaging with free-space excited whispering gallery mode microresonators", Proc. SPIE 12139, Optical Sensing and Detection VII, 121390D (17 May 2022); https://doi.org/10.1117/12.2621297

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available