Author Affiliations
Abstract
Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen Graduate School, The University Town of Shenzhen, Xili, Shenzhen, China
A barcode-like waveguide nanostructure with discretized multilevel pixel lines is designed and optimized by a nonlinear search algorithm. We obtain the design of a one-dimensional multilevel nanostructure with ?1.04 dB efficiency for surface normal coupling to a standard single-mode fiber. Another design is achieved from the automatic optimization process, which enables polarization-independent coupling to a single-mode fiber. The optimum coupling efficiency is simulated to be ?2.83 dB for TE and ?3.49 for TM polarization centered near the 1550 nm wavelength. Polarization-dependent loss of less than 1 dB over 45.3 nm is achieved.
Integrated optics devices Integrated optics devices Diffraction gratings Diffraction gratings Photonics Research
2016, 4(6): 06000209
1 Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology, Wuhan 430074, China
2 Ministry of Education (MoE) Key Laboratory for Biomedical Photonics, Department of Biomedical Engineering,Huazhong University of Science and Technology, Wuhan 430074, China
Integrating sphere technique is widely used to measure the total reflectance and transmittance of turbid sample, but the unavoidable light loss induces some measuring error. It has never been reported whether the error depends on the shape and size of light beam. In this paper, a convolution for computing the responses to rectangular incident light beam based on the Monte Carlo method was presented. The effects of light beam shape and size, and optical properties of sample on the measurements were addressed. The results show that the light loss with rectangular incident light beam is larger than that with circular one with the same area. The more the area of light beam, the more the light loss. And the light loss induced by the optical properties of sample is much more significant than that by the shape and size of the incident light beam.
integrating spheres integrating spheres optical properties optical properties Monte Carlo Monte Carlo Frontiers of Optoelectronics
2015, 8(2): 203
