Microwave liquid-crystal variable phase grating

Yang, Fuzi; Sambles, J. R.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2041
Academic Journal
A voltage-controlled variable phase grating, at microwave frequencies, is described and its response characterized. It comprises a stack of 71 aluminium strips of 1 mm thickness separated by 75 μm spaces, filled with aligned nematic liquid crystal. For microwaves polarized normal to the grating strips there are a set of resonant transmitted frequencies. By varying the voltages applied across the liquid crystal layers and their distribution, a variable phase microwave grating is realized. This allows low-voltage control of output beam profile and intensity.


Related Articles

  • Determination of the Complex Dielectric Permittivity Industrial materials of the Adhesive Products for the Modeling of an Electromagnetic Field at the Level of a Glue Joint. Abbas, Mahmoud; Ayache, Mohammad // International Journal of Computer Science Issues (IJCSI);May2011, Vol. 8 Issue 3, p597 

    To achieve out this work we were interested in the study of microwaves techniques and also of the measurement of complex relative dielectric permittivity. It is important to measure this dielectric permittivity for the used adhesive before subjecting it to electromagnetic energy. This prediction...

  • Mutual phase-locking of microwave spin torque nano-oscillators. Kaka, Shehzaad; Pufall, Matthew R.; Rippard, William H.; Silva, Thomas J.; Russek, Stephen E.; Katine, Jordan A. // Nature;9/15/2005, Vol. 437 Issue 7057, p389 

    The spin torque effect that occurs in nanometre-scale magnetic multilayer devices can be used to generate steady-state microwave signals in response to a d.c. electrical current. This establishes a new functionality for magneto-electronic structures that are more commonly used as magnetic field...

  • High-precision measurement of azimuthal rotation of liquid crystals on solid substrates. Jánossy, I. // Journal of Applied Physics;8/15/2005, Vol. 98 Issue 4, p043523 

    A high-accuracy optical method for the determination of the rotation of the liquid-crystal director on solid substrates is reported. The measurements involve the use of a photoelastic modulator in conjunction with a white light source. The detection of the first and second harmonics of the light...

  • Tunneling of electromagnetic waves through a barrier with a periodic structure. Gevorgyan, A. H.; Gabrielyan, R. Ts.; Navasardyan, M. A. // Optics & Spectroscopy;Nov2009, Vol. 107 Issue 5, p790 

    The propagation of an electromagnetic wave through a barrier with a periodic structure is considered. An interesting manifestation of electromagnetic wave tunneling through a barrier with a periodic structure is revealed. Specifically, it is theoretically and experimentally shown that, when an...

  • Wave Nonreciprocity in Inhomogeneous Gyrotropic Media and Multilayer Systems: II. Multilayer Systems. Vardanyan, G. A.; Gevorgyan, A. A. // Optics & Spectroscopy;Dec2005, Vol. 99 Issue 6, p992 

    The propagation of electromagnetic waves in multilayer systems with a naturally (or structurally) gyrotropic layer (layers) is considered. A new mechanism of wave nonreciprocity is revealed. In particular, the wave nonreciprocity in multilayer systems with gyrotropic layers is investigated and a...

  • Unplugging electromagnetic pollution. MacNeill, Scott // Garbage;Jan/Feb92, Vol. 4 Issue 1, p38 

    Presents an inventory of the electromagnetic radiation measured from household appliances.

  • Microwave Antenna Dishes Out Performance In 6-To 8-GHz Apps.  // Electronic Design;12/8/2004, Vol. 52 Issue 27, p34 

    The article informs that The HP8 microwave antenna comes equipped with a parabolic dish measuring eight feet in diameter, suiting it for point-to-point and back-haul applications from 6 to 8 GHz. Developed by Radio Waves Inc., a division of Smiths Interconnect, it produces an extremely narrow...

  • A Multi Pulse Flight Experiment of a Microwave Beaming Thruster. Yasuhisa Oda; Masato Ushio; Kimiya Komurasaki; Koji Takahashi; Atsushi Kasugai; Keishi Sakamoto // AIP Conference Proceedings;2005, Vol. 766 Issue 1, p295 

    An experiment on a multi-pulsed microwave-beaming thruster was conducted using a high power millimeter-wave generator, gyrotron. Conical thruster models with various diameters and cone angles were tested. The momentum coupling coefficients Cm at the first and second pulses were separately...

  • Development of a novel instrument for microwave dielectric thermal analysis. Nair, Biju Kumar S.; Parkes, G. M. B.; Barnes, P. A.; Sibley, M. J. N.; Bond, G. // Review of Scientific Instruments;Apr2006, Vol. 77 Issue 4, p045108 

    The advantages of microwave heating in industrial processing are becoming more widely appreciated and the technique is of increasing commercial significance. However, knowledge of a material’s dielectric properties as a function of temperature is of considerable importance as they...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics