论文标题
基于表面色板的分散检测和超低原子的光谱
Surface-plasmon based dispersive detection and spectroscopy of ultracold atoms
论文作者
论文摘要
该论文报告了金表附近的超电原子的光学检测和光谱。探针光场用于激发表面等离子体极化子。原子气的折射率转移了等离子体共振并改变反射的光功率。因此，检测的敏感性是在气上增强的。通过从原子共振中吸收激光，从而避免了从衰落波中吸收光子，这使得检测方案可能无损。信号的光谱由FANO共振确定。我们表明，对于冷原子实验中的典型参数，可以用单个原子分辨率来检测原子。因此，该方法适用于物质波幅度的量子非隔离测量。在实验上，我们测量了30个原子的技术限制灵敏度，并扩展了检测方案，以分散表面附近的原子云。
The paper reports on the optical detection and spectroscopy of ultracold atoms near a gold surface. A probe light field is used to excite surface plasmon polaritons. The refractive index of the atomic gas shifts the plasmon resonance and changes the reflected light power. Thus, the sensitivity of the detection is plasmonically enhanced. Absorption of photons from the evanescent wave is avoided by detuning the laser from atomic resonance which makes the detection scheme potentially nondestructive. The spectrum of the signal is determined by a Fano resonance. We show that atoms can be detected nondestructively with single atom resolution for typical parameters in cold atom experiments. Thus, the method is suitable for quantum nondemolition measurements of matter wave amplitudes. Experimentally, we measure a technically-limited sensitivity of 30 atoms and extend the detection scheme to dispersively image the atom cloud near the surface.
