Showing papers by "Jian Chen published in 2002"
TL;DR: In this paper, a SiO 2 /In 2 O 3 film is used as acoustical waveguide and the acoustic waveguide is at a small angle to optical waveguide.
14 citations
TL;DR: In this article, the authors demonstrate the operation of a single-fluxquantum (SFQ) pump that is electromagnetically dual to the single-electron pump.
Abstract: We demonstrate the operation of a single-flux-quantum (SFQ) pump that is electromagnetically dual to the single-electron pump. The circuit is composed of a three-junction superconducting quantum interference device with three control lines. By applying two phase-shifted rf signals magnetically, the SFQ-pump transfers one SFQ per one cycle of the rf signals even at zero- and negatively-biased condition. The circuit was fabricated using a Nb/AlOx/Nb Josephson junction technology. When we fed rf signals of 4.5 GHz, we observed a Shapiro step crossing the zero-current axis. Periodic dependence of voltage at the zero-biasing state upon dc offset flux was also confirmed.
6 citations
TL;DR: In this paper, an autodesign method for polarization splitters and reflectors based on the beam propagation method and the golden section method is presented, which can decrease the amount of computation greatly.
Abstract: The directional coupler is one of the most important devices in the field of integrated optics, from which other optical devices such as polarization splitters and reflectors are derived. In this paper, we present an autodesign method for polarization splitters and reflectors based on the beam propagation method and the golden section method, which can decrease the amount of computation greatly. Using this method, we analyze and discuss the influence of Ti-diffusion conditions on the structural optimization of polarization splitters and reflectors quantitatively. In addition, we have fabricated a series of polarization splitters and the experimental results are consistent with theoretical analysis.
6 citations
Journal Article•
TL;DR: In this paper, the authors review the progress in BiSrCaCuO-2212 Intrinsic Josephson junctions (IJJs) by summarizing their recent results in fabrication and high frequency experiments.
Abstract: SUMMARY In this paper, we review the progress in BiSrCaCuO-2212 Intrinsic Josephson junctions (IJJs) bysummarizing our recent results in fabrication and high frequencyexperiments. Using a double-side fabrication process, a well defined number of intrinsic Josephson junctions in a well defined geometrycan be fabricated. The junctions in the stack are quite homogeneous, and the power distribution of external irradiation among the junctions is even. Shapiro steps are clearlyobserved up to 2.5 THz, and the general condition for the occurrence of Shapiro steps at frequency f is that it should be much greater than the plasma frequency fpl. Under certain conditions the Shapiro steps are zero-crossing, making some applications possible, such as quantum voltage standard etc.
2 citations