Terahertz Magneto-Optical Absorption by Cylindrical Metallic Nanowires

摘要:

运用Kubo公式对圆柱形金属纳米线的磁光响应特性进行了理论研究。结果发现：与具有抛物线型电子限制势的低维半导体量子线不同，金属纳米线的磁光吸收谱以及相位延迟响应都敏感地依赖于光的偏振，这主要是由于不同的偏振光具有不同的磁光选择定则所致。另外，电子在不同子能带间磁光跃迁所产生的光吸收在太赫兹频率范围，可以通过改变纳米线半径以及调节磁场强度来有效调节金属纳米线在太赫兹频段的共振磁光吸收特性。这些理论结果揭示了金属纳米线的基本磁光响应特性

Abstract:

We conducted a theoretical study on magneto-optical (MO) properties of cylindrical metallic nanowires. The MO conductivity was calculated using the Kubo formula. Results show that in contrast to parabolically confined quantum wires realized from low-dimensional semiconductor systems, the features of MO absorption and the retard effect of the MO response by cylindrical metallic nanowires depend sensitively on the polarization of the radiation field due to corresponding selection rules. The frequencies of resonant absorption induced by inter-subband MO transition channels are within the terahertz (THz) bandwidth and can be tuned effectively by adjusting the radius of the nanowire and/or varying the strength of the magnetic field. This study is pertinent to the potential application of metallic nanowires as frequency-tunable THz optoelectronic devices