出射光对nm光纤锥端面推力的观测
Observation of a push force on the end face of a nm fiber taper exerted by outgoing light
摘要：
对于折射率为n的透明介质中的光的动量有两种不同的建议：闵可夫斯基的版本nE/c和亚伯拉罕的版本E/（nc），其中E和c分别是光的能量和真空速度。尽管近一个世纪以来进行了许多测试和辩论，但透明电介质中的光的动量仍然存在争议。在这封信中，我们报告了一个直接观察到的向内推力的端面上的自由nm光纤锥施加的出射光。我们的结果显然支持亚伯拉罕的势头。我们的实验还表明，由入射光施加在电介质上的向内的表面压力，不同于由于镜面反射而通常认识到的压力。这种入射光引起的向内表面压力对于激光诱导惯性约束聚变的精确设计可能是有用的。
英文摘要：
There are two different proposals for the momentum of light in a transparent dielectric of refractive index n: Minkowski's version nE/c and Abrahm's version E/(nc), where E and c are the energy and vacuum speed of light, respectively. Despite many tests and debates over nearly a century, momentum of light in a transparent dielectric remains controversial. In this Letter, we report a direct observation of the inward push force on the end face of a free nm fiber taper exerted by the outgoing light. Our results clearly support Abraham momentum. Our experiment also indicates an inward surface pressure on a dielectric exerted by the incident light, different from the commonly recognized pressure due to the specular reflection. Such an inward surface pressure by the incident light may be useful for precise design of the laser-induced inertially-confined fusion.
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