Abstract
Surface plasmonic polariton (SPP) has attracted increasing interest for its ability of confining light in the subwavelength scale and breaking the diffraction limit. Recently, there have appeared several important developments of SPP applied in plasmon rulers, waveguides and resonators. By combing these concepts we present a novel hybrid plasmonic microring nano-ruler relying on the sensitive hybrid mode property and the microring resonator structure. The designed nano-ruler can measure distance in nanoscale resolution and offer adjustable sensitivity, which exceeds 14.8 as the distance is less than 5 nm by recording the transmission spectra and outstrips 200 dB/nm by observing the shift of output intensity. These demonstrations suggest that hybrid plasmonic microring nano-ruler could be a promising candidate enabling high-resoluation measurement.
Highlights
Surface plasmonic polariton (SPP) has been widely studied for its ability of confining light in the subwavelength scale, providing the potential to break the diffraction limit[1,2,3,4,5]
Measuring range of sensors based on microring is directly determined by free spectrum range (FSR)[19,20], which is defined by ΔFSR = C/(2πneff r)(where C is the speed of light in vacuum, neff is the mode effective index, r is the radius of microring)
The critical values of radius where measuring range can cover the whole distance can rise to 2.1 μm, 2.4 μm, 1.3 μm 4.3 μm in Fig. 5(b–e), respectively, which means that the measuring range improves considerably. These simulation results indicate that hybrid plasmonic nano-ruler has various ways to measure the distance between metal layer and silicon waveguide
Summary
Surface plasmonic polariton (SPP) has attracted increasing interest for its ability of confining light in the subwavelength scale and breaking the diffraction limit. There have appeared several important developments of SPP applied in plasmon rulers, waveguides and resonators By combing these concepts we present a novel hybrid plasmonic microring nano-ruler relying on the sensitive hybrid mode property and the microring resonator structure. The designed nano-ruler can measure distance in nanoscale resolution and offer adjustable sensitivity, which exceeds 14.8 as the distance is less than 5 nm by recording the transmission spectra and outstrips 200 dB/nm by observing the shift of output intensity. These demonstrations suggest that hybrid plasmonic microring nano-ruler could be a promising candidate enabling high-resoluation measurement. Measuring range of the designed nano-ruler is discussed
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