The growing use of photonic integrated circuits in light detection and ranging (LiDAR) sensors has made the speckle and phase distribution of the reflected light relevant for coupling into the guided modes of these systems. We adopt the use of a simplified diffuse surface model to show the average coupling efficiency of reflected speckle into guided modes can be predicted from the optical intensity at the target. For the first time, we provide experimental results to show that this relationship is valid for predicting free-space loss as a function of range. We intend to aid optics design for integrated photonic LiDAR systems, providing a simple and accurate model to predict the free-space loss from a representative target at all distances.
INVITED
We demonstrate that all-dielectric metasurfaces provide a powerful platform for highly efficient flat optical metadevices, owing to their strong electric and magnetic dipolar response accompanied with negligible losses. We demonstrate broadband almost reflectionless metasurfaces for highly efficient amplitude, phase, and polarization manipulation based on the generalized Huygens principle. In this approach we utilize the superposition of several electric and magnetic multipolar scattering contributions of the constituent meta-atoms to achieve destructive interference in reflection over a large spectral bandwidth. By employing this approach, we demonstrate reflectionless broadband half-wave plates, quarter-wave plates, and vector beam q-plates that can operate across several telecom bands.
Here we present a general approach for describing the physics of Fano resonances in nanoparticle oligomers. It is shown that the interference of nonorthogonal collective eigenmodes is a sufficient condition to produce Fano resonances. We then show that such nonorthogonality between eigenmodes also permits the existence of a new form circular dichroism in the absorption and scattering cross-sections, even when circular dichroism is forbidden in the extinction cross-section.
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