We design an effective microsystem by integrating ultra thin Ag film patterned with two-dimensional nanodisk array with a microfluidic channel. The refractive index of liquid, which flowing through the channel, is determined by measuring the transmission spectra of this integrated microfluidic device. We systematically simulated the influence of structure parameters to refractive index sensitivity. By adjusting the structure parameters of two-dimensional nanodisk array, such as period, thickness and duty cycle, the sensitivity of refractive index can be improved. The results indicated that the refractive index sensitivity can reach up to 308 nm / refractive index unit (RIU) with proper design. By this way, we can achieve intuitive, convenient and non-polluted refractive index measurement.
Metallic glasses with unique properties, such as large plasticity within supercooled liquid region ΔT and excellent wear resistance, have attracted much attention in recent years. However, the applications of thin film metallic glass (TFMG) in optical area are seldom reported yet. Here, we proposed a reflective color filter with simple sub-wavelength nanorods fabricated with MgZnCa metallic glasses. Using the finite-difference time-domain (FDTD) methods, we systematically simulated the reflection spectra with different parameters such as the diameter and the height of nanorods. The simulation results indicate that the reflection efficiency is as high as 80%, and the color can be adjusted by changing the parameters effectively, which could be of significance for designing desirable color filters by selecting the appropriate nanostructure parameters. More importantly, the color filter facilitates the scalability to the optical application of TFMG and possesses the potential of large-scale fabrication due to the MgZnCa TFMG has low glass transition temperature (Tg) and large plasticity within ΔT.
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