Plasmonic chemical and biological sensors have many advantages such as compact sizes and extremely high sensitivity. Biosensors based on plasmonic waveguides and resonators are one of the most attractive candidates for mobile and portable devices. In this work, we proposed a metal-insulator-metal waveguide semi-ring resonator loaded with nanodots periodically decorated in the cavity. The spectral characteristics of the sensor designs are studied via the finite element method. For comparison purpose, a standard semi-ring resonator of equivalent geometric parameters is also studied. It has been shown that the sensitivity of the proposed sensor design can be significantly increased by decorating nanodots in the cavity which allows the sensitivity to reach a value of 1084.21 nm/RIU. With these excellent properties, this chip-scale MIM design is believed to be able to find potential applications in integrated photonic systems, such as optical sensing and optical networking fields.

等离子体化学和生物传感器具有许多优点，例如尺寸紧凑和灵敏度极高。基于等离子波导管和谐振器的生物传感器是移动和便携式设备最有吸引力的候选之一。在这项工作中，我们提出了一个金属-绝缘体-金属波导半环谐振器，该谐振器中装有周期性装饰的纳米点。通过有限元方法研究了传感器设计的光谱特性。为了比较，还研究了等效几何参数的标准半环谐振器。已经表明，通过在空腔中装饰纳米点可以显着提高所提出的传感器设计的灵敏度，这可以使灵敏度达到1084.21 nm / RIU的值。凭借这些优异的性能，