大规模悬浮纳米机械薄膜的相干热发射
Coherent Thermal Emission from Large-Scale Suspended Nanomechanical Membranes
AI总结：
该研究提出利用无图案毫米级悬浮SiC纳米机械薄膜的简单波干涉实现相干热发射，无需光刻和近场极化激元，具备偏振不敏感、窄带和天线式方向性，为低成本热红外光源开辟新途径。
摘要：
热辐射是一种丰富的非相干光形式。通过白炽发光产生相干红外光，有望成为昂贵且外延工艺复杂的量子级联激光器的廉价替代方案，但这仍是一个根本性挑战。以往的方法利用热近场中出现的极化激元激发的空间相干性，通过图案化微米或纳米散射体将其衍射到远场区域。这种方法需要高分辨率光刻，难以大规模扩展，并且由于极化激元固有的偏振特性，输出的耦合辐射有限。我们克服了这些限制，并报道了通过简单波干涉实现的相干热发射。我们证明，无图案的毫米级悬浮SiC纳米机械薄膜对两种线偏振均能工作，并表现出类似天线的方向性，且不依赖于近场极化激元的激发。无需光刻即可在大尺度上产生偏振不敏感、窄带且空间相干的炽热光，这一能力为普及热红外技术铺平了道路。
英文摘要：
Thermal radiation is an abundant form of incoherent light. Generating coherent infrared light through incandescence promises a cheap alternative to the costly and epitaxially complex quantum cascade laser, however it remains a fundamental challenge. Previous approaches leveraged the spatial coherence of polaritonic excitations that occur in the thermal near-field, by diffracting them into the far-field zone via patterned micro- or nano-scatterers. This approach requires high-resolution lithography, is difficult to scale-up, and yields limited outcoupled radiation due to the intrinsically polarized nature of polaritons. We overcome these limitations and report coherent thermal emission through simple wave interference. We show that unpatterned, millimeter-scale, suspended nanomechanical membranes of SiC operate for both linear polarizations and exhibit antenna-like directionality without relying on the excitation of near-field polaritons. The ability to generate polarization-insensitive, narrowband and spatially coherent incandescent light without lithography at large scales paves the way towards democratizing thermal infrared technologies.
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