Time-resolved electroluminescence studies of III-nitride ultraviolet photonic-crystal light-emitting diodes
Transient responses of III-nitride photonic-crystal (PC) ultraviolet (UV) light-emitting diodes (LEDs) were measured by picosecond time-resolved electroluminescence (EL) spectroscopy. Triangular array...
Transient responses of III-nitride photonic-crystal (PC) ultraviolet (UV) light-emitting diodes (LEDs) were measured by picosecond time-resolved electroluminescence (EL) spectroscopy. Triangular array...
High-performance diamond/amorphous silicon p-n+ heterojunctions
We have fabricated high-performance p–n+ heterojunctions of homoepitaxial diamond (B-doped film: p type) and hydrogenated amorphous silicon (P-doped a-Si:H film: n type). Current–voltage (I&...
We have fabricated high-performance p–n+ heterojunctions of homoepitaxial diamond (B-doped film: p type) and hydrogenated amorphous silicon (P-doped a-Si:H film: n type). Current–voltage (I&...
Microwave SQUID multiplexer
Appl. Phys. Lett. 85, 2107 (2004); doi:10.1063/1.1791733
Issue Date: 13 September 2004
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We describe a superconducting quantum interference device (SQUID) multiplexer operated at microwave frequencies. The outputs of multiple SQUIDs are simultaneously modulated at different frequencies and summed into the input of one high electron mobility transistor (HEMT). The large bandwidth and dynamic range provided by HEMT amplifiers should make it possible to frequency-division multiplex a large number of SQUIDs in one output coaxial cable. We measure low SQUID noise (~0.5 µ
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at 4 K) and demonstrate the multiplexed readout of two direct current (dc) SQUIDs at different resonant frequencies. In this work, dc SQUIDs are used, but this approach is equally applicable to radio-frequency SQUIDs.
0/| History: | Received 21 May 2004; accepted 21 July 2004 |
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