论文标题
球形各向异性对分子质量光学系统光学质量传感的影响
Influence of spherical anisotropy on optical mass sensing in a molecular-plasmonic optomechanical system
论文作者
论文摘要
我们使用全光泵探针方法在室温下在分子等离子体系统中开发质量传感机理。该系统由一个双晶石烯纳米替比组成，该纳米替烯与两种类型的各向同性和各向异性球形等离子体腔相互作用。基于模式选择性的量化方案和与腔光力学的规范模型的类比，我们根据电磁蔬菜张量制定了系统的哈密顿量。通过这种方式，我们得出了一种明确的尺寸依赖性光力耦合函数和等离子阻尼速率的形式，其中包括等离子体结构的模态，几何和材料特征。等离激元纳米结构的工程材料特征，我们发现径向各向异性球形纳米腔的探针场传输光谱与由于模式量减少而导致的银球纳米腔相比显着增强。该方案可以在室温下实现最小可测量的质量。
We use an all-optical pump-probe method to develop a mass sensing mechanism in a molecular plasmonic system at room temperature. The system consists of a double-clamped graphene nanoribbon that parametrically interacts with two types of isotropic and anisotropic spherical plasmonic cavities in the presence of a strong pump field and a weak probe pulse. Based on the mode-selective quantization scheme and analogy with the canonical model of the cavity optomechanics, we formulate the Hamiltonian of the system in terms of the electromagnetic Greens tensor. In this manner, we derive an explicit form of size-dependent optomechanical coupling function and plasmonic damping rate, which include the modal, geometrical, and material features of the plasmonic structure. Engineering material features of the plasmonic nanostructure, we find that the intensity of the probe field transmission spectrum for radially anisotropic spherical nanocavity enhances significantly compared to the silver sphere nanocavity due to the mode volume reduction. This scheme can provide to achieve the minimum measurable mass at room temperature.
