Digital Planar Holography

        After the huge success of electronic integrated circuits many believed that optical integrated circuits would follow suit. While the electric current easily follows wiring bends, light tends to propagate straight, making interconnection of optical elements difficult. Yet large investments in optical communications in the last two decades have resulted in the development of promising integrating technologies, including arrayed waveguide gratings and planar waveguides.

 

NanoOptic Devices was formed in 2007 to unleash the potential of Digital Planar Holography (DPH), realizing a variety of complex photonic functions and devices on compact planar wafer chips compatible with modern microlithographic manufacturing processes.

 

Since then, the team of highly qualified, accomplished physicists and scientists supported by their investors has proven and tested the technology in a variety of applications.  These applications include record-bright laser diodes, multiplexers/demultiplexers, on-chip spectrometers and quantum computing.  The innovativeness of DPH technology is confirmed and protected by both fully granted and pending U.S. technology patents, some of which are listed below.

 

DPH based devices are integrated optics components, that are capable of processing light and propagating inside planar optical waveguides.  A transfer function is defined by locations of millions of nano-features, embedded into the waveguide and resonantly interacting with light.  DPH based device production comprises several steps:

 

  1. Determination of a desired transfer function

  2. Calculation of the nano-feature map

  3. Simulating the device performance

  4. Production of digital planar holograms by microlithography methods (CMOS process)

  5. Testing of the produced DPH chips

  6. Packaging and calibration of devices

 

The technology utilizes spatially controlled separation and combination of light wave in planar waveguides, enabling arbitrary discrete spectral and spatial signal arrangement and distribution. It combines the flexibility of digital holography with well-developed microlithography mass-production techniques.  DPH based devices are compact, inexpensive, robust, and ready for integration with fibers and into other photonic light circuit components.

 

One of the first completed devices using DPH technology is the Nano-Stick Spectrometer in which the DPH chip serves as a diffractive device performing a spectral decomposition of input light followed by focusing the different spectral components (wavelengths) at the different locations at the chip output where a linear CCD detector array is installed.

 

Other DPH based devices are envisioned and in development include: optical interconnects, stabilizers of laser wavelength, laser beam combiners, selectors of laser modes, nano-sensors, to name a few...

 

        NOD Patents:

 

1. 8,451,871 Method of manufacturing a laser diode with improved light-emitting characteristics

2. 8,085,821 Light-enhancing device and method based on use of an optically active lasing medium in combination with digital planar holography

3. 7,929,190 Integrated planar optical device based on digital planar holography

4. 7,889,336 Optical integrated nano-spectrometer

5. 7,872,788 Method of digitally processing optical waves in integrated planar optical devices that operate on the principle of digital planar holography

Recent scientific articles:

  1. C. Peroz, C. Calo, A. Goltsov, S. Dhuey, A. Koshelev, P. Sasorov, I. Ivonin, S. Babin, S. Cabrini, and V. Yankov, "Multiband wavelength demultiplexer based on digital planar holography for on-chip spectroscopy applications", Opt. Lett.  37, 695-697 (2012).

  2. Babin, S. et al. “Digital optical spectrometer-on-chip”, Applied Physics Lett. 95, 041105-041105-041103 (2009).

  3. Yankov, V. et al. “MC. Peroz, S. Dhuey, A. Goltsov, M. Volger, B. Harteneck, I. Ivonin, A. Bugrov, S. Cabrini, S. Babin, V. Yankov, Digital spectrometer-on-chip fabricated by step and repeat nanoimprint lithography on pre-spin coated films, Microelectronic Engineering, Volume 88, Issue 8, August 2011, Pages 2092-2095, ISSN 0167-9317,ultiwavelength Bragg gratings and their application to optical MUX/DEMUX devices”, IEEE Photon. Technol. Lett.,15, 410-412 (2003).

  4. C. Peroz, S. Dhuey, A. Goltsov, M. Volger, B. Harteneck, I. Ivonin, A. Bugrov, S. Cabrini, S. Babin, V. Yankov, "Digital spectrometer-on-chip fabricated by step and repeat nanoimprint lithography on pre-spin coated films", Microelectronic Engineering, Volume 88, Issue 8, August 2011, Pages 2092-2095, ISSN 0167-9317

  5. Babin, S.; Peroz, C.; Bugrov, A.; Goltsov, A.; Ivonin, I.; Yankov, V.; Dhuey, S.; Cabrini, S.; Kley, E. -B; Schmidt, H., "Fabrication of novel digital optical spectrometer on chip," Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures , vol.27, no.6, pp.3187,3191, Nov 2009

DPH structure