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  1. Subbaraman, Harish; and Chen, Ray T,; Method of Manufacturing Polymer Optical Waveguides and Devices Thereof, U. S. Patent Number US9,195,005 B2, Issue date Nov 24, 2015 (USPTO)
  2. Guo, Yunbo; Subbaraman, Harish; and Chen, Ray T.; Integrated Photonic Crystal Structures and Their Applications. U.S. Patent Number US9157856 B2, Issue date 10/13/2015 (USPTO)
  3. Wang, Alan; Chen, Ray T.; and Subbaraman, Harish; Photonic Crystal Band-Shifting Device for Dynamic Control of Light Transmission. U.S. Patent Number US8,571,373 B2, Issue date Oct 29, 2013 (USPTO)
  4. Subbaraman, Harish; and Chen, Ray T.; Two-dimensional surface normal slow-light photonic crystal waveguide optical phased array. U.S. Patent Number US8,200,055, Issue date June 12, 2012 (USPTO)