We show that the forces associated with near-field optical micromanipulation can be greatly increased through the use of cavity enhanced evanescent waves. This approach utilizes a resonant dielectric waveguide structure and a prism coupler to produce Fabry-Ṕrot-like cavity modes at a dielectric-fluid interface. Fabricated structures show a ten times enhancement in the optical interaction and optical force for micrometer-sized colloids. In addition, stable accumulation and ordering of large scale arrays of colloids are demonstrated using two counter-propagating cavity enhanced evanescent waves.
Bibliographical noteFunding Information:
The authors would like to acknowledge the discussions of Professor G. Spalding and Professor M. Gu. M. Gu is supported by an EPSRC visiting fellowship. This work, as part of the European Science Foundation EUROCORES programme NOMSAN, was supported by funds from the UK Engineering and Physical Sciences Research Council and the EC Sixth framework programme and the European Commission 6th framework programme NEST ADVENTURE Activity, through Project ATOM-3D (Contract No. 508952).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)