4 papers
Enhancing Conversion Gain in HEB Mixers using Negative Differential Resistance
Boris S. Karasik, Changyun Yoo
This work investigates how negative differential resistance (NDR) can be utilized to enhance conversion gain in superconducting niobium nitride (NbN) hot-electron bolometer (HEB) m…
Hot-electron bolometric mixer with negative differential resistance
Chang Yoo, Akim A. Babenko, Boris S. Karasik
We demonstrate that the conversion gain of a superconducting hot-electron bolometer (HEB) mixer can be increased by biasing the device within the negative differential resistance (…
Lumped-Element Model of THz HEB Mixer Based on Sputtered MgB2 Thin Film
Changyun Yoo, Changsub Kim, Daniel P. Cunnane +1
We present a comprehensive analysis and experimental study of THz hot-electron bolometer (HEB) mixers made from 40-nm-thick sputtered magnesium diboride (MgB2) thin films on high-r…
THz Metal-Mesh Bandpass Filters with Diamond-shaped Apertures for Sensitive THz Receivers
Changyun Yoo, Jeffrey L. Hesler, Boris S. Karasik
We present high-performance terahertz (THz) metal-mesh bandpass filters developed to mitigate direct detection effects in sensitive THz receivers based on superconducting hot-elect…