Nanodiamond optical sorting at the femtonewton scale inside a tapered glass capillary

Christophe Pin; Ryohei Otsuka; Keiji Sasaki

doi:10.1117/12.2577160

5 March 2021 Nanodiamond optical sorting at the femtonewton scale inside a tapered glass capillary

Christophe Pin, Ryohei Otsuka, Keiji Sasaki

Proceedings Volume 11637, Microfluidics, BioMEMS, and Medical Microsystems XIX; 116370Q (2021) https://doi.org/10.1117/12.2577160
Event: SPIE BiOS, 2021, Online Only

Abstract

While optical forces may provide very efficient techniques to manipulate and sort nanomaterials according to their optical properties, experimental realizations remain challenging. In most cases, the key issue lies in the imbalance between the fast Brownian diffusion of nanoscale objects and the weak, localized effect of optical forces. We propose here a new approach based on tapered glass capillaries with only few-μm²-large cross-section areas. The transparent pipe-like structure of tapered glass capillaries allows for simultaneously confining and guiding both the light and the liquid solution in a narrow, few-mm-long optofluidic channel. In this work, a tapered glass capillary is filled with a liquid dispersion of fluorescent nanodiamonds, cleaved, and sealed. Light from a green laser source is then coupled to one end of the capillary. Optical transport of nanodiamonds is observed by fluorescence microscopy. Velocities of nanodiamonds reaching few tens of micrometers per second are measured at the waist of the tapered capillary. In the presence of a liquid flow inside the optofluidic channel, size-dependent sorting of a large ensemble of nanodiamonds is demonstrated. Based on an analytical model, we evaluate the influence of the nanodiamonds’ size on both the optical and the hydrodynamic drag forces acting on the nanoparticles. Our results show that tapered glass capillaries provide a suitable optofluidic platform to achieve efficient optical sorting of nanoparticles by exploiting optical forces as weak as few femtonewtons.

Conference Presentation

Citation Download Citation

Christophe Pin, Ryohei Otsuka, and Keiji Sasaki "Nanodiamond optical sorting at the femtonewton scale inside a tapered glass capillary", Proc. SPIE 11637, Microfluidics, BioMEMS, and Medical Microsystems XIX, 116370Q (5 March 2021); https://doi.org/10.1117/12.2577160

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