To ensure stable output of the 780 nm band laser with a large splitting ratio, a high splitting ratio depolarizing beam splitter was designed and fabricated in this paper. Initially, the double-sided depolarizing film system was designed and simulated. Subsequently, the sample was fabricated using ion beam assisted deposition. The film structure of the sample was analyzed using a TEM, and its transmittance spectrum was measured with a spectrophotometer. The spectral results showed that in the working band wider than 60 nm, the transmittance of the beam splitter was close to 98%, and the transmittance deviation is less than 0.3%. Finally, experiments were conducted to evaluate the performance of the beam splitter. The depolarizing beam splitter presented in this paper demonstrates excellent depolarization performance and is suitable for direct application in precision measurement fields such as optical test metrology and quantum sensing detection.
Metasurfaces refers to an artificial sheet material with sub-wavelength periodicity, and had sparked a general interest in their capability to manipulate electromagnetic (EM) fields at high flexibility. One of metasurfaces’ function is performing generalized refraction and reflection, granting it ability similar to of 3D optical instruments such as prism and lens, but executable at a nanoscale level. Using Finite-Difference Time-Domain (FDTD) algorithm, we had designed a metasurface with its unit cell consisting of four TiO2 rods of same height and different radius to collimate incoming plane wave with 30° incident angle. The refracted wave propagated in direction normal to the metasurface with transmission power of 86% with respect to source.
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