This paper proposes a self-reference SPR sensor with high performance based on metallic rectangular nano-hole array and a four-layer stacked LID - HID (Low Index Dielectrics and High Index Dielectrics) dielectric structure, which is useful to improve the stability of the sensor against the environmental factors. The surface plasmon (SP) mode arising from the metallic rectangular nano-hole array is served as sensing mode and is sensitive to the RI of the analyte. The guided mode resonance (GMR) excited in the stacked dielectric structure is served as a self-reference mode and is not sensitive to the analyte. After optimization with FDTD method, the results of the experiment showed that the proposed sensor can achieve a FOM of 320 RIU-1 and the sensitivity of 800 nm/ RIU for the sensing mode, and a quality factor of 7368 for the self-reference mode. The stability of the sensor has reached 1600, which has better performance than the previous self-reference SPR sensors, and has potential applications in high-precision biochemical sensing, high-Q filtering, and advanced photonic devices.
In this paper, a kind of absorber based on local surface plasmon resonances is designed by using the finite difference time domain (FDTD) method. The absorber can realize the nearly perfect absorption from visible light to the near-infrared wavelength. The absorber consists of the bottom metal tungsten (W) as substrate, the middle dielectric layer aluminum oxide (Al2O3), and the multilayered nanocircular disk and nanoelliptic disk. The four layered nanodisk structure materials are Ti- Al2O3 -Ti- Al2O3, and these nanodisks are periodically and symmetrically arranged. Numerical analysis shows that the average absorption rate of the absorber can reach 97.2% in the working band of 426~1947nm, and the absorption bandwidth is 1521nm. By analyzing the electromagnetic field distribution of the resonant wavelength, it can be seen that characteristics of the ultra-broadband and high absorption in the absorber are attributed to the local surface plasmon resonance (LSPR). This kind of absorber with ultra-broad band and high absorption absorber is expected to play an important role in photoelectric devices, solar energy collection and other fields.
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