An ultra-compact surface plasmon polaritons (SPPs) narrow band-pass filter based on a slot cavity is proposed and numerically investigated. Attributed to the coupled resonances in the cavity, the filter demonstrates pass-band selection capability. Also, by varying the positions of output waveguides, the filter shows the spectrally splitting function. Moreover, the combination of the adjustments to the length/width of the slot cavity and to the coupling distance provides more flexibility in design for the locations and widths of the pass-bands of the proposed filter.
Optical phonons assisted infrared absorption in VO2 based bolometer is demonstrated to be free, low, or over damping oscillation over different spectral ranges depending on the passivation thickness. In particular, it will become saturated due to the over damping oscillation in the spectral range corresponding to the absorption bands from strong phonon vibrations. The device reaches a peak absorbance of 99.9% at wavelength of 9.1μm and shows a broadband absorption, independent of metal-insulator transition and radiation incident angle up to 30° in the long wavelength (8–14μm) infrared region.
In this letter a nonlinear equation method based on effective-medium approximation is presented to calculate the band structure of photonic crystal slabs. At a definite wave vector, the normalized frequency is inversely proportional to the effective refractive index of the photonic crystals. Effective-medium approximation is used to calculate the effective refractive indices of the two dimensional photonic crystals and photonic crystal slab. The corresponding relation between the band structure of the photonic crystal slab and that of two dimensional photonic crystals is given by a nonlinear equation. Through the nonlinear equation, the three dimensional photonic crystal slabs problems are simplified as two dimensional simulations. The results by this method agree very well with those of three dimensional finite-difference time-domain method and the calculation is much faster.
Athermal and flat-topped transmissions are the two main requirements for a silicon WDM filter. A Mach-Zehnder (MZ) filter which simultaneously satisfies these two requirements has been experimentally demonstrated in this paper. A combination of strip waveguide and hybrid strip-slot waveguide is introduced for athermalization, and two-stage interference is utilized for flat-topped transmission. The temperature dependent wavelength shift is measured to be ~-5 pm/K while the best 1 dB bandwidth is 5.5 nm with 14.7 nm free spectral range (FSR). The measured minimum insertion loss is only 0.4 dB with a device dimension of 170 μm × 580 μm. Moreover, Such a MZ filter is compatible with the state-of-art CMOS-fabrication process and its minimum feature size is as large as 200 nm.
Health has always been a hot topic of concern, whereas cancer is one of the largest security risks to human health. Although the existing drug delivery systems (DDSs) have been extensively reported and commercially applied, there are still some issues that have yet to be well-resolved, including the toxicity, side-effects, and targeted therapy efficiency of drugs. Consequently, it is still necessary to develop a novel, highly efficient, controlled and targeted DDS for cancer therapy.
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