Microwave Hall effect

Figure 10. (a) Two-mode cavity and (b) microwave circuit for Faraday rotation (microwave Hall effect) experiments. 

Figure 43. Microwave transmission in a two-mode resonator as a function of the magnetic field strength for measurement of the microwave Hall effect in FeS2 (two measurements with an offset difference).16...

T. E. Cross and R. Pethig, Microwave Hall Effect Measurements on Biopolymers, Int. J. Quantum Chem. Quantum Biol. Symp. 7, 389-395 (1980). 

Thermoacoustic computed tomography, microwave imaging. Hall effect imaging, magnetomammography NA NA No... 

To obtain information on the intrinsic conductivity of the film, several methods were applied. Optical conductivity of the doped film was estimated from IR measurements as microwave conductivity measurements and thermoelectric power measurements ruled out the hypothesis of a metal-like behaviour of the film [47]. Measurements of the Hall effect were also attempted [48]. The effect of electron beam irradiation on the film conductivity showed the possibilities for application to the area of microlithography [49]. 

Microwave power and its effect on the electrode/electrolyte interface, 439 Microwave region, Hall experiments, 453 Microwave spectroscopy, intensity modulated photo currents, 508 Microwave transients for nano crystalline desensitized cells, 514 Microwave transmission, as a function of magnetic field, 515 Minority carriers... 

Lee, R.E., Manthey, F.A., and Hall, C.A., III 2003. Effects of boiling, refrigerating, and microwave heating on cooked quality and stability of lipids in macaroni containing ground flaxseed. Cereal Chem. 80, 570-574. 

Fig. 1 illustrates the dissipative (i ) and Hall R cy) resistance characteristics of a high mobility device under microwave excitation at 103.5 GHz. Here, the new radiation-induced effect occurs at relatively low magnetic fields, in this instance B < 0.4 Tesla, and the effect includes giant magnetoresistance oscillations. Remarkably, it turns ont that, at the deepest minima, the resistance falls well below the R cx measnied withont photoexcitation, as it vanishes over broad 5-intervals around (4/5)Bf and 4/9)Bf Here, note that the small magnetic fields involved in this low B-field study can be easily realized with small solenoids or commercially available permanent magnets. 

Proximity and presence Proximity sensors, motion detectors Optical, capacitive, resistive, inductive. Hall, Doppler, magnetostrictive effect. Infrared sensitivity, microwave, ultrasonics... 

The second approach is based on FM sideband spectroscopy, a different modulation method, which is well known in microwave spectroscopy, but whose advantages in the optical region have only recently been demonstrated by J. L. Hall et al. (19), and, independently, by G. C. Bjorklund and collaborators (20,21). In this method, the probe beam is sent through an acoustooptic or electrooptic phase modulator which produces two (or more) FM sidebands of such amplitudes and phases that any constructive or destructive interference effects cancel completely. The intensity of the probe beam, before entering the sample, remains therefore exactly constant. If the sample now changes the amplitude or the phase of any of the sidebands or the phase of the carrier, this delicate balance is perturbed, and the light acquires an amplitude modulation, which can be readily observed with a fast photodiode, followed by rf heterodyne detection. 

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