We present a new label-free three-dimensional (3D) microscopy technique, termed transport of intensity diffraction tomography with non-interferometric synthetic aperture (TIDT-NSA). Without resorting to interferometric detection, TIDT-NSA retrieves the 3D refractive index (RI) distribution biological specimens from intensity-only measurements at various illumination angles, allowing incoherent-diffraction-limited quantitative phase-contrast imaging. The unique combination z-scanning sample...

Optical diffraction tomography (ODT) is a promising label-free three-dimensional (3D) microscopic method capable of measuring the 3D refractive index (RI) distribution optically transparent samples (e.g., unlabeled biological cells). In recent years, non-interferometric ODT techniques have received increasing attention for their system simplicity, speckle-free imaging quality, and compatibility with existing microscopes. However, methods implementing measurements in high numerical aperture...

Redistributing the transverse energy flow in focal plane of a tightly focused radially polarized optical field is described. We develop from theory generalized analytical model for calculating distributions electromagnetic and Poynting vector laser beam superposed with an vortex. further explore redistribution by designing phase masks, including traditional annular vortex masks. Flexible control rings obtained these They provide simple solution to transport absorptive particles along certain...

In our work, a InSe-PVA film-type modulator was successfully prepared. Its nonlinear optical properties were investigated and its application for obtaining large-energy mode-locked Er-doped fiber laser also demonstrated. Stable operation with maximum pulse energy of 20.4 nJ at repetition rate 586.3 kHz generated. The average output power 11.96 mW under the pump 560 mW. Our findings suggest that InSe has competitive performance in acting as ultra-fast comparison commonly used two-dimensional...

Transport-of-intensity diffraction tomography (TIDT) is a recently developed label-free computational microscopy technique that retrieves high-resolution three-dimensional (3D) refractive index (RI) distribution of biological specimens from 3D intensity-only measurements. However, the non-interferometric synthetic aperture in TIDT generally achieved sequentially through acquisition large number through-focus intensity stacks captured at different illumination angles, resulting very...

The tight focusing properties of optical fields combining a spiral phase and cylindrically symmetric state polarization are presented. First, we theoretically analyze the mathematical characterization, Stokes parameters, Poincaré sphere representations arbitrary cylindrical vector (CV) vortex beams. Then, based on diffraction theory, derive build an integrated analytical model to calculate electromagnetic field Poynting distributions input CV calculations reveal that generalized beam can...

In our work, PbS/CdS core/shell quantum dots with an absorption peak of 1043 nm were successfully employed as a modulator for achieving passively Q-switched Nd-doped fiber laser. The saturation intensity and modulation depth the film-type 7.6 MW/cm2 4.1%, respectively. Due to protection CdS shell, PbS core exhibited good photo-chemical stability, which led generation stable operation. maximum average output power was 7.88 mW minimum pulse width 235.7 ns. To knowledge, this first...

Intensity diffraction tomography (IDT) is a label-free computational microscopy technique that infers 3D refractive index (RI) and absorption distributions of objects from intensity-only measurements. Nevertheless, the inherent coherent image formation model requires sequential intensity measurements under various plane wave illuminations, resulting in time-consuming data acquisition low imaging speed. In this Letter, we propose differential phase contrast (DPC-IDT), which leverages...

In this paper, we demonstrate the decoupling of complex refractive index in transport intensity diffraction tomography (TIDT) microscopy under partially coherent illumination. Specifically, with a closed-form Tikhonov-regularized solution, method enables RI and absorption from two through-focus stacks. We compared reconstruction performance our proposed other optical methods by means numerical simulations. The results showed that provides images 3D resolution targets minimal artifacts....

We present a new label-free three-dimensional (3D) microscopy technique, termed transport of intensity diffraction tomography with non-interferometric synthetic aperture (TIDT-NSA). Without resorting to interferometric detection, TIDT-NSA retrieves the 3D refractive index (RI) distribution biological specimens from intensity-only measurements at various illumination angles based on an off-the-shelf bright-field mi-croscope programmable light-emitting-diode (LED) source, allowing...

We present a new label-free three-dimensional (3D) microscopy technique, termed transport of intensity diffraction tomography with non-interferometric synthetic aperture (TIDT-NSA). Without resorting to interferometric detection, TIDT-NSA retrieves the 3D refractive index (RI) distribution biological specimens from intensity-only measurements at various illumination angles based on an off-the-shelf bright-field microscope programmable light-emitting-diode (LED) source, allowing...

We propose the optimizing design of illumination pattern in partially coherent optical diffraction tomography (PC-ODT), and custom-build quantitative criterion is demonstrated to maximize performance POTF related “goodness” evaluation an aperture. Source modulation with different segment scale gray implemented acquire arbitrary distribution source, corresponding three-dimensional (3D) phase transfer function (POTF) can be easy obtained through numerical incoherent superstition each...