The present paper pursues a fairly usual tradition basically devoted to reviews describing advances in some light scattering theories in which the illuminating beam is described using vector wave function expansions, with expansion coefficients known as beam shape coefficients. After the most recent review dealing with the period 2014-2018, the present review deals with the fiducial period 2019-2023. Relying on about 700 references, it discusses as well other light scattering approaches and applications to optical particle characterization techniques, therefore providing an overview of light scattering approaches and applications during half a decade. 

T-matrix methods for electromagnetic structured beams: A commented reference database for the period 2019–2023

Optical tweezers are proven and indispensable micro-manipulation tools. It is very common to use an immersion-assisted high NA objective for optical trapping of micrometer-sized beads. However, such objectives suffer from low working depth range. Here we show, both by theory and experiment, that a dry objective can be utilized for optimal trapping of even sub-micrometer objects. For the first time, to the best of our knowledge, we were able to stably trap polystyrene beads with radii of 270 and 175 nm in 3D using an objective with numerical aperture of 0.9. 

Optimal In-depth trapping by tuning the correction collar of a dry objective lens

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Optimal In-depth trapping by tuning the correction collar of a dry objective lens