Nanoparticle Acoustic Resonance Enhanced Nearly Degenerate Four-Wave Mixing

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• 作者：Dao Xiang ; Reuven Gordon
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：3
• 期：8
• 页码：1421-1425
• 全文大小：434K
• 年卷期：0
• ISSN：2330-4022

文摘

Nanoparticles have acoustic resonances in the 10 GHz to THz range, which makes them interesting for resonantly enhanced four-wave mixing applications such as frequency conversion. Using a nearly degenerate four-wave mixing setup and comparing with Rayleigh–Gans–Debye scattering, we estimate a nonlinear refractive index, n₂, of approximately 2 × 10^–5 cm²/MW for 22 nm polystyrene nanospheres in water at a difference frequency of 43 GHz. This is nearly 3 orders of magnitude larger than the typical below-band-gap nonlinear response of semiconductors. This strong high-frequency response may be ideal for four-wave frequency conversion in all-optical information technologies, with appropriately chosen nanoparticle sizes.