Terahertz electrometry via infrared spectroscopy of atomic vapor

Terahertz and infrared spectroscopy of gated large-area graphene.

We have fabricated a centimeter-size single-layer graphene device with a gate electrode, which can modulate the transmission of terahertz and infrared waves. Using time-domain terahertz spectroscopy and Fourier-transform infrared spectroscopy in a wide frequency range (10-10 000 cm(-1)), we measured the dynamic conductivity change induced by electrical gating and thermal annealing. Both methods...

Far Infrared Studies of Silicon using Terahertz Spectroscopy

In this work, the optical properties of ptype silicon wafers, of various thicknesses, have been studied in the frequency range of 0.2 – 1.2 THz. It is seen that, for low resistivity silicon, the optical properties are dominated by the presence of dopants. The analysis technique deployed in the present work explores a general iterative procedure to determine the real and imaginary parts of the c...

Far-infrared terahertz time-domain spectroscopy of flames.

We present what is to our knowledge the first comprehensive far-infrared absorption measurement of flames. These measurements, covering the region of 7-88 wave numbers (0.2-2.65 THz) are only now made possible by the technique of terahertz time-domain spectroscopy. We observe a large number of absorption lines-including those of water, CH, and NH(3)-in a stationary, premixed, propane-air flame....

Exploring dynamics in the far-infrared with terahertz spectroscopy.

Silicon beam splitter for far-infrared and terahertz spectroscopy.

Silicon beam splitters several millimeters thick offer numerous advantages over thin freestanding dielectric beam splitters. For routine spectroscopy for which resolutions of better than 1 cm(-1) are not required, a silicon beam splitter can replace several Mylar beam splitters to span the entire far-infrared region. In addition to superior long-wavelength performance that extends well into the...