Modeling of nonlinear optical media with the TLM-based finite-difference–time-domain method

✍ Scribed by Zhizhang Chen; Jian Xu; Jun-Ming Chuang

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 488 KB
• Volume: 13
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19961205)13:5<259::aid-mop5>3.0.co;2-f

✦ Synopsis

setup. T h e use of YBa,Cu,O, thin film does not change the antenna design and resonance frequency when compared to a normal metal. At 80 K, the improvement of efficiency was 1.2 d B over a silver counterpart working at the same temperature. This result may be even better at lower temperatures that a r e now easily obtainable with Stirling closed circuit cryogenerators well adapted to this purpose. T h e improvement of the superconducting antenna is essentially because the reduction of ohmic losses in the feeding line. In order to decrease the losses still more, we try t o reduce the surface resistance by an accurate control of the amount of intergrain weak links (e.g., high angle grain boundaries in the case of YBa,Cu,O, films grown on (100) MgO [lo]). A t present, we are working on an antenna array composed of several patches. As the ohmic losses increase rapidly with the length of the feeding lines, we hope that the use of a superconducting distribution network increases the efficiency substantially.