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Vibrational Coupling to Epsilon-Near-Zero Waveguide Modes
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-03 , DOI: 10.1021/acsphotonics.0c00071 Thomas G. Folland 1 , Guanyu Lu 1 , Autumn Bruncz 1, 2 , J. Ryan Nolen 3 , Marko Tadjer 4 , Joshua D. Caldwell 1
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-03 , DOI: 10.1021/acsphotonics.0c00071 Thomas G. Folland 1 , Guanyu Lu 1 , Autumn Bruncz 1, 2 , J. Ryan Nolen 3 , Marko Tadjer 4 , Joshua D. Caldwell 1
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Epsilon near zero modes offer extreme field enhancement that can be utilized for developing enhanced sensing schemes. However, demonstrations of enhanced spectroscopies have largely exploited surface polaritons, mostly due to the challenges of coupling a vibrational transition to volume-confined epsilon near zero modes. Here we fabricate high aspect ratio gratings (up to 24.8 μm height with greater than 5 μm pitch) of 4H-SiC, with resonant modes that couple to transverse magnetic and transverse electric incident fields. These correspond to metal–insulator–metal waveguide modes propagating downward into the substrate. The cavity formed by the finite length of the waveguide allows for strong absorption of incident infrared light (>80%) with Q factors in excess of 90, including an epsilon near zero waveguide mode with εeff = 0.0574 + 0.008i. The localization of the electromagnetic fields within the gap between the grating teeth suggests an opportunity to realize a new platform for studying vibrational coupling in liquid environments, with potential opportunities for enhanced spectroscopies. We show that these modes are supported in anhydrous and aqueous environments and that high aspect ratio gratings coherently couple to the vibrational transition in the surrounding liquid.
中文翻译：
振动耦合到Epsilon-近零波导模式
接近零模式的Epsilon提供了极端的场增强功能，可用于开发增强的感应方案。然而，增强光谱学的证明很大程度上利用了表面极化子，这主要是由于将振动跃迁耦合到接近零模的体积受限的ε这一挑战。在这里，我们制作了4H-SiC高纵横比光栅（高度高达24.8μm，间距大于5μm），其谐振模式耦合到横向磁场和横向电场。这些对应于向下传播到基板中的金属-绝缘体-金属波导模式。由波导的有限长度形成的空腔允许Q强烈吸收入射的红外光（> 80％）因素超过90，其中包括邻近与ε零波导模式的ε EFF = 0.0574 + 0.008我。磨齿之间的间隙内电磁场的定位表明，有机会实现一个新的平台，以研究液体环境中的振动耦合，并具有增强光谱学的潜在机会。我们证明了这些模式在无水和含水环境中得到支持，并且高纵横比光栅连贯地耦合到周围液体中的振动转变。
更新日期：2020-03-03
中文翻译：
振动耦合到Epsilon-近零波导模式
接近零模式的Epsilon提供了极端的场增强功能，可用于开发增强的感应方案。然而，增强光谱学的证明很大程度上利用了表面极化子，这主要是由于将振动跃迁耦合到接近零模的体积受限的ε这一挑战。在这里，我们制作了4H-SiC高纵横比光栅（高度高达24.8μm，间距大于5μm），其谐振模式耦合到横向磁场和横向电场。这些对应于向下传播到基板中的金属-绝缘体-金属波导模式。由波导的有限长度形成的空腔允许Q强烈吸收入射的红外光（> 80％）因素超过90，其中包括邻近与ε零波导模式的ε EFF = 0.0574 + 0.008我。磨齿之间的间隙内电磁场的定位表明，有机会实现一个新的平台，以研究液体环境中的振动耦合，并具有增强光谱学的潜在机会。我们证明了这些模式在无水和含水环境中得到支持，并且高纵横比光栅连贯地耦合到周围液体中的振动转变。
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