A Nipkow disk integrated with Fresnel lenses for terahertz single pixel imaging.

We present a novel Nipkow disk design for terahertz (THz) single pixel imaging applications. A 100 mm high resistivity (ρ≈3k-10k Ω·cm) silicon wafer was used for the disk on which a spiral array of twelve 16-level binary Fresnel lenses were fabricated using photolithography and a dry-etch process. The implementation of Fresnel lenses on the Nipkow disk increases the THz signal transmission compared to the conventional pinhole-based Nipkow disk by more than 12 times thus a THz source with lower power or a THz detector with lower detectivity can be used. Due to the focusing capability of the lenses, a pixel resolution better than 0.5 mm is in principle achievable. To demonstrate the concept, a single pixel imaging system operating at 2.52 THz is described.

[1]  G. S. Kino,et al.  Real‐time confocal scanning optical microscope , 1988 .

[2]  Norio Matsuki,et al.  Nipkow confocal imaging from deep brain tissues. , 2011, Journal of integrative neuroscience.

[3]  M. Nuss,et al.  Imaging with terahertz waves. , 1995, Optics letters.

[4]  P. Siegel.  Terahertz technology in biology and medicine , 2004, IEEE Transactions on Microwave Theory and Techniques.

[5]  C. Otani,et al.  Terahertz imaging system based on a backward-wave oscillator. , 2004, Applied optics.

[6]  T. Zimmermann,et al.  Live cell spinning disk microscopy. , 2005, Advances in biochemical engineering/biotechnology.

[7]  Ajay Nahata,et al.  Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection , 2002 .

[8]  M. D. Egger,et al.  New Reflected-Light Microscope for Viewing Unstained Brain and Ganglion Cells , 1967, Science.

[9]  S. M. Durbin,et al.  Multilevel silicon diffractive optics for terahertz waves , 2002 .

[10]  Wai Lam Chan,et al.  A single-pixel terahertz imaging system based on compressed sensing , 2008 .

[11]  Laurent Dussopt,et al.  Broadband terahertz imaging with highly sensitive silicon CMOS detectors. , 2011, Optics express.

[12]  M. Menu,et al.  Terahertz imaging for non-destructive evaluation of mural paintings , 2008 .

[13]  Shimul Saha,et al.  Terahertz single pixel imaging based on a Nipkow disk. , 2012, Optics letters.

[14]  Chen Li,et al.  Fabrication of Multilevel Silicon Diffractive Lens at Terahertz Frequency , 2013, IEEE Transactions on Terahertz Science and Technology.

[15]  Shuangchen Ruan,et al.  Real-time, continuous-wave terahertz imaging by a pyroelectric camera , 2008 .

[16]  A. Lee,et al.  Real-time terahertz imaging over a standoff distance (>25meters) , 2006 .

[17]  Qing Hu,et al.  Real-time, continuous-wave terahertz imaging by use of a microbolometer focal-plane array. , 2005, Optics letters.

[18]  J. Lichtman,et al.  High-resolution imaging of synaptic structure with a simple confocal microscope. , 1989, The New biologist.

[19]  Mohammad S. Alam,et al.  Infrared image registration and high-resolution reconstruction using multiple translationally shifted aliased video frames , 2000, IEEE Trans. Instrum. Meas..

[20]  Margaret B. Stern,et al.  Binary optics: A VLSI-based microoptics technology , 1996 .

[21]  H. Toyoda,et al.  Terahertz movie of internal transmission imaging. , 2007, Optics express.

[22]  P. Taday,et al.  Detection and identification of explosives using terahertz pulsed spectroscopic imaging , 2005 .