Abstract
We report on both theoretical and experimental studies of a photonic implementation of the electric (E-) field sensor using a probe made with all-dielectric RF-transparent elements. The geometrical dimensions of the electric field probe can be smaller than the wavelength of the measured electromagnetic field in the material. Our theoretical calculations show that the sensor allows detecting electric fields in a broad frequency range (100 Hz-20 GHz) with sensitivity better than 1 μV/[Hz1/2 m]. We demonstrate the sensor operating at X-band and validate the theoretical predictions.
Highlights
INTRODUCTIONElectric field (E-field) sensors have multiple applications ranging from measurement of specific absorption rate of RF radiation by human body[1,2] to the detection of charged particle beams[3] and characterization of THz laser pulses.[4]
The geometrical dimensions of the electric field probe can be smaller than the wavelength of the measured electromagnetic field in the material
Our theoretical calculations show that the sensor allows detecting electric fields in a broad frequency range (100 Hz-20 GHz) with sensitivity better than 1 μV/[Hz1/2 m]
Summary
Electric field (E-field) sensors have multiple applications ranging from measurement of specific absorption rate of RF radiation by human body[1,2] to the detection of charged particle beams[3] and characterization of THz laser pulses.[4]. Sensitivity of 15 μV/[Hz1/2 m] as well as 45 dB instantaneous dynamic range was theoretically predicted for a dual (WGM and Fabry Perot) resonator-based E-field sensor having 500 MHz frequency bandwidth. The instantaneous dynamic range of the sensor exceeds 65 dB (with respect to the field amplitude) Such a performance is possible because (i) the proposed device has a narrow (1 − 500 MHz) reception band that has a wide frequency tuning span, and (ii) it includes a special near-field RF antenna (or a near field concentrator) allowing significant concentration of the signal field in the localization area of the optical field.
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