Single-peak and narrow-band mid-infrared thermal emitters driven by mirror-coupled plasmonic quasi-BIC metasurfaces
Single-peak and narrow-band mid-infrared thermal emitters driven by mirror-coupled plasmonic quasi-BIC metasurfaces
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DOI：
10.1364/optica.514203
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发表时间：
2023-10
期刊：
影响因子：
10.4
通讯作者：
Sen Yang;Mingze He;Chuchuan Hong;Josh Nordlander;Jon-Paul Maria;J. Caldwell;Justus C. Ndukaife
中科院分区：
文献类型：
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作者：
Sen Yang;Mingze He;Chuchuan Hong;Josh Nordlander;Jon-Paul Maria;J. Caldwell;Justus C. Ndukaife
波长选择性热发射器（WS-EMs）具有相当大的吸引力，因为在中长波红外光谱中缺乏具有成本效益的窄带源。通过介电材料实现的WS-EMs通常表现出具有高质量因子（Q因子）的热发射峰，但其光学响应容易受到温度波动的影响。另一方面，金属电磁随温度变化的变化可以忽略不计，但它们的Q因子通常徘徊在10左右。在这项研究中，我们引入并实验验证了一种新型的电磁接地在连续介质（BICs）中的等离子体准束缚态。我们的设计在数值上提供了一个Q因子约为64的超窄带单峰，以及可以在超过10 {\mu}m的扩展带内自由调谐的接近统一的吸收。通过对称地引入空气槽，Q因子可以进一步增加到100左右。通过多极分析和相图来阐明其工作原理。重要的是，我们的红外光谱测量证实了我们设计的共振频率在面对300摄氏度以上的温度波动时的显着弹性。此外，我们建立了一个基于光学纳米天线理论的有效阻抗模型，以了解如何通过精确的沟槽工程来实现发射特性的进一步调谐。因此，本研究预示着等离子体准bic在设计中红外超窄带、温度稳定热发射体方面的潜力。此外，这样的概念可能适用于其他频率范围，如近红外、太赫兹和千兆赫。
Wavelength-selective thermal emitters (WS-EMs) hold considerable appeal due to the scarcity of cost-effective, narrow-band sources in the mid-to-long-wave infrared spectrum. WS-EMs achieved via dielectric materials typically exhibit thermal emission peaks with high quality factors (Q factors), but their optical responses are prone to temperature fluctuations. Metallic EMs, on the other hand, show negligible drifts with temperature changes, but their Q factors usually hover around 10. In this study, we introduce and experimentally verify a novel EM grounded in plasmonic quasi-bound states in the continuum (BICs) within a mirror-coupled system. Our design numerically delivers an ultra-narrowband single peak with a Q factor of approximately 64, and near-unity absorptance that can be freely tuned within an expansive band of more than 10 {\mu}m. By introducing air slots symmetrically, the Q factor can be further augmented to around 100. Multipolar analysis and phase diagrams are presented to elucidate the operational principle. Importantly, our infrared spectral measurements affirm the remarkable resilience of our designs' resonance frequency in the face of temperature fluctuations over 300 degrees Celsius. Additionally, we develop an effective impedance model based on the optical nanoantenna theory to understand how further tuning of the emission properties is achieved through precise engineering of the slot. This research thus heralds the potential of applying plasmonic quasi-BICs in designing ultra-narrowband, temperature-stable thermal emitters in mid-infrared. Moreover, such a concept may be adaptable to other frequency ranges, such as near-infrared, Terahertz, and Gigahertz.