Abstract
This paper presents the complex index of refraction and the complex permittivity of a magnetic ceramic material made of copper (Cu), cobalt (Co) and iron oxides. The index of refraction and the extinction coefficient of the CuCo-ferrite exhibit an almost frequency independent behavior and were averaged to n=3.62±0.05 and k=0.06±0.02. The corresponding complex permittivity was e’=13.12±0.35 for the real part and e”=0.46±0.15 for the imaginary part. The absorption coefficient and the transmittance of the CuCo-ferrite were also determined. The absorption coefficient exhibits a dip at ~0.35 THz, which corresponds to a peak in transmittance at this particular frequency. The impact of the observations on the potential realization of novel THz electronic devices is discussed.
Highlights
IntroductionAn unexplored gap in the electromagnetic spectrum has been massively studied
During the last decades, an unexplored gap in the electromagnetic spectrum has been massively studied
Since our THz analysis has a minimum frequency stablished at ~0.2 THz, we can estimate that an area with the size close to the respective wavelength (~1.5 mm) should not be an issue, since the measurement would predict the average composition of the sample
Summary
An unexplored gap in the electromagnetic spectrum has been massively studied. Some sources that generate THz waves are the photomixer (McIntosh et al 1995), the quantum cascade laser (Williams 2007), the microwave frequency multiplier (Li and Yao 2010), the backward wave oscillator (Mineo and Paoloni 2010), the free electron laser (Williams 2002), synchrotron light sources (Roy et al 2006), and so on Among all these methods, a commonly one used is the THz Time-Domain Spectroscopy (THz-TDS) system, which has the advantage to measure the amplitude and phase of THz electromagnetic radiation in the time domain, allowing a large frequency range to be evaluated in a single run. THz‐TDS systems usually utilize photo-conductive antennas or electro-optic crystals excited by femtosecond near-infrared laser pulses as THz radiation sources and detectors, combined with lock-in detection and a time delay stage (Bründermann et al 2012)
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