Second harmonic generation from metamaterials strongly coupled to intersubband transitions in quantum wells

被引：59

作者：

Campione, Salvatore ^{[1
,2
,3
]}

Benz, Alexander ^{[1
,2
]}

Sinclair, Michael B. ^{[1
]}

Capolino, Filippo ^{[3
]}

Brener, Igal ^{[1
,2
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

[2] Sandia Natl Labs, Ctr Integrated Nanotechnol CINT, Albuquerque, NM 87185 USA

[3] Univ Calif Irvine, Dept Elect Engn & Comp Sci, Irvine, CA 92697 USA

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 13期

关键词：

SPLIT-RING RESONATORS; MAGNETIC METAMATERIALS; HARMONIC-GENERATION; OPTICAL-PROPERTIES; PATTERNED GAAS; SUSCEPTIBILITY; MICROSCOPY; LASER;

D O I：

10.1063/1.4870072

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We theoretically analyze the second harmonic generation capacity of two-dimensional periodic metamaterials comprising sub-wavelength resonators strongly coupled to intersubband transitions in quantum wells (QWs) at mid-infrared frequencies. The metamaterial is designed to support a fundamental resonance at similar to 30 THz and an orthogonally polarized resonance at the second harmonic frequency (similar to 60 THz), while the asymmetric quantum well structure is designed to provide a large second order susceptibility. Upon continuous wave illumination at the fundamental frequency we observe second harmonic signals in both the forward and backward directions, with the forward efficiency being larger. We calculate the overall second harmonic conversion efficiency of the forward wave to be similar to 1.3 x 10(-2) W/W-2 -a remarkably large value, given the deep sub-wavelength dimensions of the QW structure (about 1/15th of the free space wavelength of 10 mu m). The results shown in this Letter provide a strategy for designing easily fabricated sources across the entire infrared spectrum through proper choice of QW and resonator designs. (C) 2014 AIP Publishing LLC.

引用

页数：5

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