Holographic microfabrication and characterization system for soft matter and biological systems

• US 8,431,884 B2
• Filed: 12/06/2010
• Issued: 04/30/2013
• Est. Priority Date: 11/07/2006
• Status: Active Grant

• Current Assignee: New York University
• Original Assignee: New York University
• Inventors: Grier, David G.
• Primary Examiner(s): MASKELL, MICHAEL P
• Application Number:
  US12/928,178
• Publication Number:
  US 20110114831A1
• Time in Patent Office: 876 Days
• Field of Search: 250/251
• US Class Current: 250/251
• CPC Class Codes: G02B 21/32 Micromanipulators structurally combined with microscopes
• CPC Class Codes: G02B 5/001 Axicons, waxicons, reflaxicons
• CPC Class Codes: G02B 5/32 Holograms used as optical elements
• CPC Class Codes: G03H 1/08 Synthesising holograms, i.e. holograms synthesized from objects or objects from hologramsusing electric digital computers G06F; G06T
• CPC Class Codes: G03H 1/2294 Addressing the hologram to an active spatial light modulator
• CPC Class Codes: G03H 2001/0077 for optical manipulation, e.g. holographic optical tweezers [HOT]

Abstract

A method and system for micromanipulation of objects of any shape. The method and system creates various forms of holographic optical traps for a variety of commercial purposes. Some alternate forms of traps include a dark form of optical traps, optical vortices with different helical winding numbers and optical traps with variable phase profiles imprinted thereon.

Claims

1. A method of micromanipulating a plurality of particles of any shape, comprising:

providing a source of light;

providing a diffractive optical element;

processing the light using the diffractive optical element to create a plurality of optical traps, each of the optical traps having an associated potential energy well;

calibrating each of the plurality of the optical traps by an internal measure of forces characterizing the associated potential energy well of each of the optical traps, thereby providing time resolved information on forces imparted to the plurality of particles;

further processing the light with optical components to produce alternate forms of the plurality of the optical traps; and

applying the alternate forms of the plurality of the optical traps to perform a force calibrated micromanipulation of at least one object of any shape for a selected commercial purpose.

2. The method as defined in claim 1 further including the commercial steps of using a dark form of the plurality of the optical traps to trap the particles which are incompatible with conventional optical traps.

3. The method as defined in claim 1 wherein the step of calibrating comprises tracking thermally driven motion of a trapped one of the plurality of particles.

4. The method as defined in claim 1 further including at least one additional subsystem comprised of a holographic microscopy subsystem wherein the subsystem performs a step of forming a plurality of images and incorporating volumetric data in each of the plurality of images.

5. The method as defined in claim 3 wherein the step of tracking thermally driven motion comprises a step of statistically analyzing trajectories of the optically trapped particles.

6. The method as defined in claim 1 wherein the calibrating step includes measuring an interference pattern created from interacting an unscattered portion of a beam of the light with a portion of the light scattered out of each of the plurality of the optical traps, thereby measuring motion of each of the particles in the associated potential energy well of the optical trap, thereby determining the time resolved information on the forces imparted to the plurality of the particles.

7. The method as defined in claim 1 further including providing an objective lens and a condenser lens and wherein the step of calibrating the optical traps includes the step of resolving images of each of the plurality of optical traps projected through the condenser in a plane intermediate a front and back plane of the objective lens.

8. The method as defined in claim 1 wherein the alternate forms of the plurality of the optical traps comprises an axicon phase profile enabling the additional step of forming Bessel beam line optical traps which pass deeply into microfluidic channels which are part of an optical fractionation system.

9. The method as defined in claim 1 wherein the alternate forms of the plurality of the optical traps is applied in a step comprising the projecting of patterns of the plurality of the optical traps in multiple color wavelengths of the light, thereby enabling multi-color trapping and photochemical processing steps.

10. The method as defined in claim 1 wherein the alternate forms of the plurality of the optical traps are selected from the group of a dark form of the plurality of the optical traps for trapping the particles incompatible with conventional optical traps, optical vortices with different helical winding numbers for selectively applying rotational motion to the particles and the plurality of the optical traps with the alternate forms of the plurality of the optical traps imprinted thereon for creating various dimensional shapes for the micromanipulation of the particles.

11. The method as defined in claim 1, wherein the step of performing micromanipulation includes fabricating three-dimensional structures from dielectric building blocks.

12. The method as defined in claim 1, wherein the step of performing micromanipulation includes at least one of assembling and characterizing a three-dimensional photonic band gap material.

13. The method as defined in claim 1, wherein the step of performing micromanipulation includes at least one of assembling and characterizing a semiconductor for electromagnetic wave processing and output.

14. The method as defined in claim 13 wherein the electromagnetic wave is selected from visible, radio and microwave wavelengths.

15. The method as defined in claim 1, wherein the step of performing micromanipulation includes processing a high refractive index materials into three-dimensional photonic band gap microstructures.

16. The method as defined in claim 15 wherein the high respective index material has a refractive index at least as high as titania.

17. The method as defined in claim 1, wherein the step of performing micromanipulation includes processing and organizing titania particles into a permanent structure for commercial use.

18. The method as defined in claim 1, wherein the step of performing micromanipulation includes assembling icosahedral quasicrystals for forming three-dimensional photonic band gap materials.

19. The method as defined in claim 1, wherein the step of performing micromanipulation includes assembling colloidal quasicrystals and gelling the quasicrystals into solid structures by photopolymerising a surrounding fluid medium.

20. The method as defined in claim 19 where the photopolymerising step comprises using ultraviolet LEDs to apply ultraviolet light.