575 citations · 1.5k across the 17 of their papers we have counts for
5 papers · 1 filter
Tapered nanofiber trapping of high-refractive-index nanoparticles
Jon D. Swaim, Joachim Knittel, Warwick P. Bowen
A nanofiber-based optical tweezer is demonstrated. Trapping is achieved by combining attractive near-field optical gradient forces with repulsive electrostatic forces. Silica-coate…
Back-scatter based whispering gallery mode sensing
Joachim Knittel, Jon D. Swaim, David L. McAuslan +2
Whispering gallery mode biosensors allow selective unlabelled detection of single proteins and, combined with quantum limited sensitivity, the possibility for noninvasive realtime…
Subdiffraction-limited quantum imaging within a living cell
Michael A. Taylor, Jiri Janousek, Vincent Daria +4
We report both sub-diffraction-limited quantum metrology and quantum enhanced spatial resolution for the first time in a biological context. Nanoparticles are tracked with quantum…
Detection of Nanoparticles with a Frequency Locked Whispering Gallery Mode Microresonator
Jon D. Swaim, Joachim Knittel, Warwick P. Bowen
We detect 39 nm x 10 nm gold nanorods using a microtoroid stabilized via the Pound-Drever-Hall method. Real-time detection is achieved with signal-to-noise ratios up to 12.2. These…
Optical lock-in particle tracking in optical tweezers
Michael A Taylor, Joachim Knittel, Warwick P Bowen
We demonstrate a lock-in particle tracking scheme in optical tweezers based on stroboscopic modulation of an illuminating optical field. This scheme is found to evade low frequency…