Transmission terahertz waveguide-based imaging below the diffraction limit

Using a terahertz line source from a near dispersion-free parallel plate waveguide, we demonstrate broad bandwidth imaging at terahertz frequencies with subwavelength image resolution. Terahertz radiation is coupled into a parallel plate waveguide with a 100μm plate spacing, which serves as the imaging aperture. The image data are collected as projections and the final image is reconstructed using the filtered back-projection algorithm, similar to that in x-ray computed tomography. Images taken using a waveguide-based line source demonstrate higher resolution than can be achieved using a confocal cylindrical lens setup.

[1]  S Wang,et al.  T-ray Imaging and Tomography , 2003, Journal of biological physics.

[2]  L. Boivin,et al.  T-ray tomography. , 1997 .

[3]  Daniel R. Grischkowsky,et al.  Characterization of an optoelectronic terahertz beam system , 1990 .

[4]  Koji Mizuno,et al.  Experimental demonstration for scanning near-field optical microscopy using a metal micro-slit probe at millimeter wavelengths , 1997 .

[5]  Richard Alan Cheville,et al.  Terahertz beam propagation measured through three-dimensional amplitude profile determination , 2003 .

[6]  G. Massey.  Microscopy and pattern generation with scanned evanescent waves. , 1984, Applied optics.

[7]  D. Grischkowsky,et al.  Quasi-optic synthetic phased-array terahertz imaging , 2004 .

[8]  Koji Mizuno,et al.  Scanning near-field millimeter-wave microscopy using a metal slit as a scanning probe , 2001 .

[9]  Ieee Microwave Theory,et al.  Quasioptical systems : Gaussian beam quasioptical propagation and applications , 1998 .

[10]  Richard Alan Cheville,et al.  Time resolved synthetic aperture terahertz impulse imaging , 2001 .

[11]  M. Reiten,et al.  Effect of spherical aberration and surface waves on propagation of lens-coupled terahertz pulses. , 2005, Optics letters.

[12]  Martin Koch,et al.  THz near-field imaging , 1998 .

[13]  A. B. Ruffin,et al.  Time reversal and object reconstruction with single-cycle pulses. , 2001, Optics letters.

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

[15]  J. Goodman.  Introduction to Fourier optics , 1969 .

[16]  Anil K. Jain.  Fundamentals of Digital Image Processing , 2018, Control of Color Imaging Systems.

[17]  R. Kersting,et al.  Terahertz imaging with nanometer resolution , 2003 .

[18]  Fuad E. Doany,et al.  Carrier Lifetime vs. Ion-Implantation Dose in Silicon on Sapphire , 1987, Topical Meeting on Picosecond Electronics and Optoelectronics.

[19]  D. Grischkowsky,et al.  Undistorted guided-wave propagation of subpicosecond terahertz pulses. , 2001, Optics letters.

[20]  S. Deans.  The Radon Transform and Some of Its Applications , 1983 .