Band Compression of Plasmonic Filters

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（9）
• 页码范围: 76-79
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/9/094206

摘要

We demonstrate theoretically and experimentally the difference between the band compression mechanisms of plasmonic gratings and plasmonic heterogratings.The plasmonic grating can pick out a fixed polarization bandwidth with changing the incidence angle,while the plasmonic heterograting composed of two different nanogratings can pick out a tunable bandwidth with changing the incidence angle and the period ratio of two gratings.The range of the plasmonic resonances of the heterograting is about 30％ wider than that of a conventional grating.Thus,the plasmonic heterograting can work efficiently in a wider wavelength range.Moreover,high polarization extinction ratio is achieved in these plasmonic devices.This gives more insights into the mechanisms in plasmonic filters and is helpful to promote the actual applications.