High- T _c superconducting THz emitters fabricated by wet etching

We studied the etching of small crystals of the high-T_c superconductor Bi₂Sr₂CaCu₂O_8+δ (Bi2212) with various dilute compositions of hydrochloric and nitric acids. A particular mixture of those acids was chosen to simultaneously fabricate multiple rectangular stand-alone Bi2212 mesa...

Cavity modes in broadly tunable superconducting coherent terahertz sources

We discuss the cavity modes and radiation pattern in solid state terahertz (THz) sources based on layered high-temperature superconducting Bi ₂ Sr ₂ CaCu ₂ O _8+δ (Bi-2212). We experimentally measure the emission spectra using the Fourier transform infrared spectrometer in order to elucidate the...

Improved excitation mode selectivity of high- T_csuperconducting terahertz emitters

Using our recent design of thermally managed sandwich device structures, we studied the radiation frequency characteristics of three such devices of the same rectangular dimensions made from the same single crystal of the high-T_c superconductor Bi₂Sr₂CaCu₂O₈₊ _δ, and all three...