Electrically tunable hot-silicon terahertz attenuator
نویسندگان
چکیده
We have developed a continuously tunable, broadband terahertz attenuator with a transmission tuning range greater than 10. Attenuation tuning is achieved electrically, by simply changing the DC voltage applied to a heating wire attached to a bulk silicon wafer, which controls its temperature between room temperature and !550 K, with the corresponding free-carrier density adjusted between !10 cm"3 and !10 cm"3. This “hot-silicon”-based terahertz attenuator works most effectively at 450–550 K (corresponding to a DC voltage variation of only !7 V) and completely shields terahertz radiation above 550 K in a frequency range of 0.1–2.5 THz. Both intrinsic and doped silicon wafers were tested and demonstrated to work well as a continuously tunable attenuator. All behaviors can be understood quantitatively via the free-carrier Drude model taking into account thermally activated intrinsic carriers. VC 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4897531]
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