- document
-
Gan, Y. (author), Mirzaei, B. (author), Silva, J. R.G. (author), Cherednichenko, S. (author), Van Der Tak, F. (author), Gao, J.R. (author)We have studied THz heterodyne detection in sub-micrometer MgB2 hot electron bolometer (HEB) mixers based on superconducting MgB2 films of ∼ 5 nm (HEB-A), corresponding to a critical temperature (Tc) of 33.9 K, and ∼ 7 nm (HEB-B), corresponding to a T c of 38.4 K. We have measured a double sideband (DSB) receiver noise temperature of 2590 K...journal article 2023
- document
-
Gan, Y. (author), Mirzaei, B. (author), Silva, J. R.G. (author), Laauwen, W. (author), Van Der Tak, F. F.S. (author), Gao, J.R. (author)We present an analysis of the bandwidth of an asymmetric 8-beam Fourier grating as the beam multiplexer for a 4.7 THz local oscillator used in a heterodyne receiver. We take the grating designed for NASA GUSTO balloon observatory as an example to address the bandwidth question although it does not need to operate over a wide frequency range....journal article 2022
- document
-
Mirzaei, B. (author), Gan, Y. (author), Finkel, M. (author), Groppi, Christopher (author), Young, Abram (author), Walker, Christopher (author), Hu, Qing (author), Gao, J.R. (author)A full demonstration of the Fourier phase grating used as 4.7 THz local oscillator (LO) multiplexer for Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory (GUSTO) is presented in this paper, including its design, modeling, tolerance analysis, and experimental characterizations of the angular and intensity distributions among 2 ×...journal article 2021
- document
-
Gan, Y. (author), Mirzaei, B. (author), van der Poel, S. (author), Silva, Jose R.G. (author), Finkel, M. (author), Eggens, Martin (author), Ridder, M.L. (author), Khalatpour, Ali (author), Gao, J.R. (author)We present a terahertz spatial filter consisting of two back-to-back (B2B) mounted elliptical silicon lenses and an opening aperture defined on a thin gold layer between the lenses. The beam filtering efficiency of the B2B lens system is investigated by simulation and experiment. Using a unidirectional antenna coupled 3rd-order distributed...journal article 2020
- document
-
Gan, Yuner (author), Mirzaei, B. (author), Silva, Jose R.G. (author), Khalatpour, Ali (author), Hu, Qing (author), Groppi, Christopher (author), Siles, Jose V. (author), van der Tak, Floris (author), Gao, J.R. (author)Large heterodyne receiver arrays (~100 pixel) allow astronomical instrumentations to map more area within limited space mission lifetime. One challenge is to generate multiple local oscillator (LO) beams. Here, we succeeded in generating 81 beams at 3.86 THz by combining a reflective, metallic Fourier grating with an unidirectional antenna...journal article 2019