In this paper, we propose a dielectric cylindrical lens and a dielectric spherical lens with dual polarity operating at visible frequencies. Composed of an array of nanofins with high aspect ratio as phase shifting elements, the designed dielectric dual-polarity lens have higher scattering efficiency and polarization conversion power than plasmonic dualpolarity lens. The phase variation from 0 to 2π is determined by adjusting the orientation angle of the individual nanofins according to the PB phase. By controlling the helicity of the incident circularly polarized light, the positive and negative polarity are interchangeable in one designed metalens. We demonstrate the broadband metalens possess a wavelength controllable focal length with incident wavelength from 488 to 740 nm. The dielectric dual-polarity metalens may open a new avenue for advanced research and applications in focusing and imaging devices, angular-momentum-based quantum information processing and integrated nano-optoelectronics.
The temperature-dependent reflection spectrums of ultrahigh order guided modes of symmetrical metal-cladding waveguide (SMCW) are measured in angular interrogation. The results show that the reflection spectrum is characterized by extremely narrow resonance dip, which agrees well with numerical calculation. Based on the falling or rising edge of resonance dip of ultrahigh order guided modes of SMCW, a temperature sensor with characteristic of high sensitivity is proposed. Meanwhile, by experimentally determine the linear character between the shift of resonance angle and the variation of temperature, a method of angle compensation is put forward to extend the sensing range. Owing to its characteristics of high sensitivity, low cost and easy fabrication, the temperature sensor based on SMCW will be a promising sensor in many fields.
The analysis of the temperature property of sensors based on symmetrical metal-cladding optical waveguide (SMCOW) is focused on analyzing the temperature property of reflectivity of SMCOW sensors, which is theoretically studied with single-factor investigation under spectral and angular interrogation scheme. There are mainly four factors influencing the temperature dependence of reflectivity, it is the temperature dependence of refractive index and thickness of guiding layer, along with the temperature dependence of the metal film thickness and metal-dielectric function. The simulation result shows that the effect of temperature on the reflectivity of SMCOW is mainly attributed to the temperature dependence of refractive index and thickness of guiding layeron the contrary, the temperature properties of metal film hardly contributes to the influence of temperature on the reflectivity. Based on the analysis, the sensitivities of SMCOW with guiding layer of different optical glasses are computed under both spectral and angular interrogation. This paper is supposed to provide direction in designing temperature-sensitive SMCOW structure sensors.
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