System, apparatus and method for using birefringent lenses to create holograms from received electromagnetic radiation

Abstract

The inventors have discovered a method to improve image quality in holography and, for the first time, utilize lenses made from birefringent materials to advantageously split an incoming beam of either coherent or incoherent light into two coincident beams with different focal lengths that interfere with one another and thus create holograms free of electro-optical or pixelated devices. This discovery has many advantages over current methods to create holograms in which many components, including multiple lenses, other electro-optical devices, and/or beam paths are necessary to create holograms. The current invention provides a purely optical holographic process which has better performance and holographic simplicity, in addition to being able to miniaturize holographic processes more than is currently possible in state of the art holography systems.

1 . An optical apparatus, comprising:
 a plurality of lenses including at least one lens having non-quantized anisotropic electromagnetic properties, wherein the plurality of lenses are configured to:
 receive electromagnetic radiation from an object, wherein the electro magnetic radiation is incoherent light; 
 transform, by refraction using the at least one lens having non-quantized anisotropic electromagnetic properties, the received electromagnetic radiation to generate two or more differentially modulated electromagnetic waves propagating in a common path; and 
 provide for the differentially modulated electromagnetic waves to create electromagnetic interference. 
   
     
     
         2 . The optical apparatus according to  claim 1 , wherein the at least one lens having non-quantized anisotropic electromagnetic properties includes a birefringent lens. 
     
     
         3 . The optical apparatus according to  claim 2 , wherein another lens is configured to modify the focal length of each of the differentially modulated electromagnetic waves exiting the birefringent lens. 
     
     
         4 . The optical apparatus according to  claim 3 , wherein a spacing factor of the differentially modulated electromagnetic waves is changeable according to a focal length of said another lens. 
     
     
         5 . The optical apparatus according to  claim 4 , wherein said another lens is a glass lens. 
     
     
         6 . The optical apparatus according to  claim 2 , wherein the birefringent lens comprises alpha or beta barium borate materials. 
     
     
         7 . The optical apparatus according to  claim 2 , wherein the birefringent lens comprises liquid crystal material encased in flat or positively or negatively curved birefringent materials. 
     
     
         8 . The optical apparatus according to  claim 2 , wherein the birefringent lens comprises liquid crystal material encased in flat or positively or negatively curved non-birefringent materials. 
     
     
         9 . The optical apparatus according to  claim 1 , wherein the electromagnetic interference forms a hologram representing the object. 
     
     
         10 . The optical apparatus according to  claim 9 , wherein the hologram is a FINCH hologram. 
     
     
         11 . The optical apparatus according to  claim 9 , wherein the hologram is any of a Fresnel hologram, a Fourier hologram, a FINCH hologram, or an off-axis hologram. 
     
     
         12 . The optical apparatus according to  claim 1 , wherein the received electromagnetic radiation is from a microscope. 
     
     
         13 . The optical apparatus according to  claim 1 , further comprising a camera configured to record the interference. 
     
     
         14 . The optical apparatus according to  claim 1 , the apparatus being further configured to use the electromagnetic interference as an excitation pattern in scanning holography. 
     
     
         15 . The optical apparatus according to  claim 1 , the apparatus being further configured to use the electromagnetic interference in an excitation source in a Structured Illumination (SIM) imaging system. 
     
     
         16 . The optical apparatus according to  claim 1 , wherein the optical apparatus is contained within a microscope objective lens. 
     
     
         17 . The optical apparatus according to  claim 1 , further comprising at least one compensating optic to minimize phase-delay between the differentially modulated electromagnetic waves relative to the coherence length of the electromagnetic radiation. 
     
     
         18 . The optical apparatus according to  claim 1 , wherein the compensating optic is a birefringent compensating optic. 
     
     
         19 . A method comprising:
 receiving electromagnetic radiation from an object, wherein the electromagnetic radiation is incoherent light;   transforming, by refraction using at least one lens having non-quantized anisotropic electromagnetic properties, the received electromagnetic radiation to generate two or more differentially modulated electromagnetic waves propagating in a common path; and   providing for the differentially modulated electromagnetic waves to create electromagnetic interference.   
     
     
         20 . The method according to  claim 19 , wherein the at least one lens having non-quantized anisotropic electromagnetic properties includes a birefringent lens.