Large optical nonlinearity enabled by coupled metallic quantum wells
| Autor: | Zhaowei Liu, Su Wen Hsu, Andrea R. Tao, Haoliang Qian, Shilong Li, Ching-fu Chen, Qian Ma, Steven Edward Bopp |
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| Rok vydání: | 2019 |
| Předmět: |
lcsh:Applied optics. Photonics
Materials science Letter Orders of magnitude (temperature) Physics::Optics 02 engineering and technology Dielectric Optical Physics 01 natural sciences 010309 optics Condensed Matter::Materials Science Electric field 0103 physical sciences lcsh:QC350-467 Quantum well business.industry lcsh:TA1501-1820 Nonlinear optics Second-harmonic generation Heterojunction 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Semiconductor Optoelectronics 0210 nano-technology business lcsh:Optics. Light |
| Zdroj: | Light, science & applications, vol 8, iss 1 Light, Science & Applications Qian, Haoliang; Li, Shilong; Chen, Ching-Fu; Hsu, Su-Wen; Bopp, Steven Edward; Ma, Qian; et al.(2019). Large optical nonlinearity enabled by coupled metallic quantum wells. LIGHT-SCIENCE & APPLICATIONS, 8(1), 13. doi: 10.1038/s41377-019-0123-4. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/0s3361cf Light: Science & Applications, Vol 8, Iss 1, Pp 1-7 (2019) |
| Popis: | New materials that exhibit strong second-order optical nonlinearities at a desired operational frequency are of paramount importance for nonlinear optics. Giant second-order susceptibility χ(2) has been obtained in semiconductor quantum wells (QWs). Unfortunately, the limited confining potential in semiconductor QWs causes formidable challenges in scaling such a scheme to the visible/near-infrared (NIR) frequencies for more vital nonlinear-optic applications. Here, we introduce a metal/dielectric heterostructured platform, i.e., TiN/Al2O3 epitaxial multilayers, to overcome that limitation. This platform has an extremely high χ(2) of approximately 1500 pm/V at NIR frequencies. By combining the aforementioned heterostructure with the large electric field enhancement afforded by a nanostructured metasurface, the power efficiency of second harmonic generation (SHG) achieved 10−4 at an incident pulse intensity of 10 GW/cm2, which is an improvement of several orders of magnitude compared to that of previous demonstrations from nonlinear surfaces at similar frequencies. The proposed quantum-engineered heterostructures enable efficient wave mixing at visible/NIR frequencies into ultracompact nonlinear optical devices. |
| Databáze: | OpenAIRE |
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