Patent Number: 
Section: claims

1. A method for concentrating particles, comprising:a) placing the particles close to and/or on at least one waveguide of a support;b) injecting, into the waveguide, light radiation forming one or more stationary waves produced through at least one diffraction grating, the injecting causing grouping of particles into one or plural clusters on the waveguide and concentrating or blocking particles into one or plural stationary clusters on a same waveguide. 2. A method for concentrating particles according to claim 1, wherein the support includes plural waveguides, and the injecting b) leads to formation of plural clusters distributed on one or plural of the waveguides. 3. A method according to claim 1, wherein the particles are cells or macromolecules or microballs. 4. A method according to claim 1, wherein the particles are glass balls and/or gold balls. 5. A method according to claim 1, wherein the radiation is in a spectral range between near ultraviolet and infrared. 6. A method according to claim 5, wherein the radiation is in a range between visible red and infrared. 7. A method according to claim 1, wherein the particles are immersed in a liquid. 8. A method according to claim 7, wherein the liquid is water. 9. A method according to claim 1, further comprising stopping injecting the light radiation as soon as a cluster is formed. 10. A method for concentrating particles, comprising:a) placing the particles close to and/or on at least one waveguide of a support, the waveguide forming at least one optical loop; andb) injecting light radiation into the waveguide, the light radiation forming one or more stationary waves, the injecting causing grouping of particles into one or plural clusters on the waveguide and concentrating or blocking particles into one or plural stationary clusters. 11. A method according to claim 10, wherein the particles are cells or macromolecules or microballs. 12. A method according to claim 10, wherein the particles are glass balls and/or gold balls. 13. A method for concentrating particles, comprising:a) placing the particles close to and/or on at least one waveguide of a support, the waveguide forming at least one optical loop, the waveguides being joined together in at least one concentration point; andb) injecting light radiation into the waveguide, the injecting causing grouping of particles into a single cluster located on the concentration point and concentrating or blocking particles into one or plural stationary clusters. 14. A method according to claim 13, wherein the particles are cells or macromolecules or microballs. 15. A method according to claim 13, wherein the particles are glass balls and/or gold balls. 16. A method according to claim 13, further comprising stopping injecting the light radiation as soon as a cluster is formed. 17. A method for concentrating particles, comprising:a) marking particles to modify their optical index and placing the particles close to and/or on at least one waveguide of a support;b) injecting light radiation into the waveguide, the injecting causing grouping of particles into one or plural clusters on the waveguide; andc) concentrating or blocking particles into one or plural stationary clusters. 18. A method according to claim 17, wherein the particles are cells or macromolecules or microballs. 19. A method according to claim 17, wherein the particles are glass balls and/or gold balls. 20. A method according to claim 17, further comprising stopping injecting the light radiation as soon as a cluster is formed.