Microwave phase conjugation in a liquid suspension of elongated microparticles

Shih, Robert; Fetterman, H. R.; Ho, W.J.; McGraw, Robert M.; Rogovin, D.; Bobbs, Bradley

doi:10.1103/physrevlett.65.579

Cited by 30 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the radiation wavelength is 3 cm, the particles are 100-pm copper spheres and the angle between the beams is 90', then~D =6.41 s for beam intensities of 100 W/cm . For 18-6Hz radiation and the same beam powers and propagation directions, the medium response time will be on the order of 174 s. The optical response time for the formation of a translational grating in a carbon fiber microparticle suspension at these wavelengths and particle sizes is on the order of several h to a few d [6]. Finally, although the medium response time scales inversely with the dynamic viscosity of the air, decreasing the air pressure will not necessarily reduce the medium response time.…”

Section: Transient Dynamics Of a Rolling Sphere A Equations Of mentioning

confidence: 99%

“…For millimeter wavelengths the medium response time scales to more than 10 sec, which is too long for feasible labo- 46 7242 1992 The American Physical Society ratory experiments. Thus, use of particle translation as a means to achieve nonlinear-optical processes from submillimeter wave to microwave wavelengths requires significant improvement of the medium response time to be of any interest [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Four-wave-mixing processes in translational optomechanical media

1992

Self Cite

View full text Add to dashboard Cite

We study the mechanical, dielectric, and nonlinear-optical response of translational optomechanical media to incident electromagnetic radiation. These media consist of three-dimensional arrays of electrically small, isotropic particles that are mechanically supported but free to roll on stacks of very thin transparent planes. Electrostrictive forces tend to move the spheres in such a way as to form spatial variations in the particle density that correspond to electromagnetically induced spatial modulations in the array's dielectric constant. These modulations constitute translational optical index gratings that can be used to control the propagation characteristics of electromagnetic radiation. We study optical phase conjugation, pump-beam modulation, and harmonic phase conjugation at submillimeter, millimeter, and microwave wavelengths in this class of nonlinear media. We also examine the dynamics of these media from the perspective of the Langevin equations and determine the influence of thermal fluctuations on the properties of such an array.PACS number(s): 42.65.Hw

show abstract

Section: Transient Dynamics Of a Rolling Sphere A Equations Of mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Four-wave-mixing processes in translational optomechanical media

1992

Self Cite

View full text Add to dashboard Cite

show abstract

“…Phase conjugation at microwave frequencies has attracted much attention in recent years [1][2][3] Optical birefringence2 and phase conjugation via degenerate four-wave mixing (DFWM)3 using a mineral oil-heptane suspension of shaped carbon microfibers at centimeter wavelength has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

<title>Fabrication of optomechanical structures suitable for microwave phase conjugation</title>

1996

View full text Add to dashboard Cite

The fabrication and testing of optomechanical structure which can be used for microwave phase conjugation is described. It consists of the metal-coated dielectric elongated beams 1 mm x 100 im x 10 im suspended by nonconductive torsional springs attached to a microwave transparent frame. Standard photolithography techniques combined with dry XeF2 etching yield hundred of rotating elements on a single 4" silicon wafer. Rotation of single elements, in a polarized electromagnetic field at 15 GHz, was measured and found to be in a good agreement with theory. This first experimental implementation of combining the concept of nonlinear microwave devices and microelectromechanical systems demonstrates the potential of an entirely new class of devices.

show abstract

“…In the latter case, PC has been observed in various wave systems manifesting sufficiently strong nonlinear interactions, e.g. microwaves [54] and acoustic waves [55]. In fact, the first observation of PC in acoustics was made long before the observation of the optical PC [55].…”

Section: Theoretical Backgroundmentioning

confidence: 99%