Results 11 to 20 of about 1,330 (167)
Optical Aberration Calibration and Correction of Photographic System Based on Wavefront Coding [PDF]
Sensors, 2021 Yibing Shen
exaly +2 more sources
Extension ratio of depth of field by wavefront coding method
Optics Express, 2008 An analysis of the depth of field (DOF) of the wavefront coding imaging system with a cubic phase mask is presented. A necessary condition on the base of that MTF of wavefront coding system is defocus-independent is described. Then the extension ratio of the DOF relative to that of traditional optical system is calculated.
Rongfu Zhang, Jiabi Chen, Songlin Zhuang
exaly +3 more sources
Spectrally exclusive phase masks for wavefront coding [PDF]
Optics Letters, 2021 The use of phase masks is necessary for wavefront coding, and these are often based on optical path differences. However, the optical dispersion constrains the resulting device to operate within a restricted spectral bandwidth. Here we propose to remove this constraint due to sub-wavelength structuration of the surface.
Micke Boher +4 more
openaire +2 more sources
Learning Wavefront Coding for Extended Depth of Field Imaging [PDF]
IEEE Transactions on Image Processing, 2021 Depth of field is an important factor of imaging systems that highly affects the quality of the acquired spatial information. Extended depth of field (EDoF) imaging is a challenging ill-posed problem and has been extensively addressed in the literature.
Ugur Akpinar +4 more
openaire +6 more sources
Secure communication with coded wavefronts
2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2017 Communication between a sender and receiver can be made secure by encrypting the message using public or private shared keys. Quantum key distribution utilizes the unclonability of a quantum state to securely generate a key between the two parties [1]. However, without some way of authentication of either the sender or the receiver, a man-in-the-middle
Uppu, Ravitej +5 more
openaire +3 more sources
Infrared imaging with a wavefront-coded singlet lens
Optics Express, 2009 We describe the use of wavefront coding for the mitigation of optical aberrations in a thermal imaging system. Diffraction-limited imaging is demonstrated with a simple singlet which enables an approximate halving in length and mass of the optical system compared to an equivalent two-element lens.
Gonzalo, Muyo +5 more
openaire +2 more sources
Ultra-high resolution coded wavefront sensor
Optics Express, 2017 Wavefront sensors and more general phase retrieval methods have recently attracted a lot of attention in a host of application domains, ranging from astronomy to scientific imaging and microscopy. In this paper, we introduce a new class of sensor, the Coded Wavefront Sensor, which provides high spatio-temporal resolution using a simple masked sensor ...
Wang, Congli +3 more
openaire +3 more sources
Broadband photon sieves imaging with wavefront coding
Optics Express, 2015 A novel method for broadband imaging of using a diffractive photon sieves is proposed and experimentally demonstrated. Unlike conventional photon sieves imaging in which clear imaging is only valid at a single designed wavelength due to the strong wavelength-dependent nature of diffractive elements, broadband photon sieves imaging is implemented with ...
Xiaonan, Zhao +3 more
openaire +2 more sources
Moiré‐Induced Symmetry Breaking of Charge Order in van der Waals Heterostructures
Advanced Materials, EarlyView.A uniaxial moiré potential in misfit (MS)1+δTaS2 heterostructures selectively reshape charge order: the embedded 1H‐TaS2 layer hosts an incommensurate charge‐density wave, fragmented into nanometer domains and stripped of threefold symmetry. Superconductivity, however, remains uniform and fully gapped, revealing heterosymmetry stacking as a selective ...
Sandra Sajan +12 more
wiley +1 more source
Terahertz wavefront engineering using a hard-coded metasurface
Optical and Quantum Electronics, 2023 During the past few years, coding metamaterials (MM) drew significant attention, where the far-field scattering/transmission pattern of the electromagnetic wave (particularly in the THz regime) can be encoded into a single or few-bit digitized phase-response of the metasurface, thereby enabling a full digital control.
Noori, Aileen +6 more
openaire +2 more sources