Using Low-Loss Phase-Change Materials for Mid-Infrared Antenna Resonance Tuning
Using Low-Loss Phase-Change Materials for Mid-Infrared Antenna Resonance Tuning
复制标题
DOI：
10.1021/nl4006194
复制
发表时间：
2013-08-01
期刊：
影响因子：
10.8
通讯作者：
Taubner, Thomas
中科院分区：
文献类型：
--
作者：
Michel, Ann-Katrin U.;Chigrin, Dmitry N.;Taubner, Thomas
我们通过改变相变材料层的折射率n来调谐铝纳米天线的谐振频率。已经考虑了三种配置，即，在层的顶部，内部和下面的天线。相变材料在从非晶态到晶态的结构转变时提供巨大的折射率变化，两者在室温下都是稳定的。由于其介电常数的虚部在中红外光谱范围内小得可以忽略，因此避免了谐振阻尼。我们提出了共振移位到较低以及更高的波数，最大移位为19.3%和调谐品质因数，定义为共振移位除以半峰全宽（FWHM）的共振峰，为1.03。
We show tuning of the resonance frequency of aluminum nanoantennas via variation of the refractive index n of a layer of phase-change material. Three configurations have been considered, namely, with the antennas on top of, inside, and below the layer. Phase-change materials offer a huge index change upon the structural transition from the amorphous to the crystalline state, both stable at room temperature. Since the imaginary part of their permittivity is negligibly small in the mid-infrared spectral range, resonance damping is avoided. We present resonance shifting to lower as well as to higher wavenumbers with a maximum shift of 19.3% and a tuning figure of merit, defined as the resonance shift divided by the full-width at half-maximum (FWHM) of the resonance peak, of 1.03.