15 papers · ranked by Valyu relevance
Agnieszka Siemion
Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures based on diffraction…
Jiafan Guan, Zhipeng Dong, Xianyue Deng, Yuzuru Takashima + 2 more
'Jonathan B. Hopkins' 'Robert M. Panas'] Phase light modulator (PLM) by MEMS mirror array operating in a piston-mode motion enables a high-speed diffractive beam steering in a random-access and flexible manner that makes a lidar system more intelligent and adaptive. Diffraction efficiency is determined by the range of…
Haoxiang Jiang, Jingfeng Liu, Gengyan Chen, Xue-Hua Wang
The diffraction spectra of imaginary-part photonic crystal (IPPC) slabs are analyzed using the scattering-matrix method. By investigating the thickness dependence of the diffraction, we find a remarkable red shift of central wavelength of the diffraction spectrum, which obviously distinguishes from the phenomenon of…
Ye Wang, Yongyi Chen, Li Qin, Lijun Wang + 1 more
Since surface relief transmission gratings have very strict requirements on operators and use environment, according to the semiconductor laser external cavity spectral beam combining system, this paper proposes a design scheme for a semiconductor laser array spectral beam combining system based on the grating-external…
Elisa Bonnini, Elisa Buffagni, Andrea Zappettini, Stephen Doyle + 1 more
'Claudio Ferrari'] It is demonstrated that crystals with curved diffracting planes made of relatively light elements, such as silicon, germanium and gallium arsenide, in the Laue diffraction geometry and in an energy range between 60 and 600 keV can reach a higher diffraction efficiency than more dense mosaic crystals…
István Bányász, István Rajta, Vladimír Havránek, María Cinta Pujol + 3 more
Quasi-Sinusoidal Surface Relief Optical Transmission Gratings in Pyrex and IOG Glasses by Implantation with Oxygen and Nitrogen Ion Microbeams of the 5–6 MeV Energy Range Authors: ['István Bányász' 'István Rajta' 'Vladimír Havránek' 'María Cinta Pujol' 'Gábor Bazsó' 'György Kármán' 'Gyula Nagy'] A method for the…
Bum Suk Zhao, Weiqing Zhang, Wieland Schöllkopf
Researchers observed universal diffraction of He, He2, and D2 quantum-reflected tens of nanometers above a ruled diffraction grating.
Xingang Dai, Yanjun Hu, Bowen Niu, Qun Dai + 6 more
Diffractive optical elements (DOEs) are specialized optical components that manipulate light through diffraction for various applications, including holography, spectroscopy, augmented reality (AR) and virtual reality (VR), and light detection and ranging (LiDAR). The performance of DOEs is highly determined by…
Bassam Hajj, Laura Oudjedi, Jean-Bernard Fiche, Maxime Dahan + 1 more
'Marcelo Nollmann'] Multifocus microscopy (MFM) allows sensitive and fast three-dimensional imaging. It relies on the efficient design of diffraction phase gratings yielding homogeneous intensities in desired diffraction orders. Such performances are however guaranteed only for a specific wavelength. Here, we discuss a…
Hee-Dong Jeong, Seong-Won Moon, Seung-Yeol Lee, Daniel Ramos
Diffraction is a fundamental phenomenon that reveals the wave nature of light. When a plane wave is transmitted or reflected from a grating or other periodic structures, diffracted light waves propagate at several angles that are specified by the period of the given structure. When the optical period is shorter than…
Yitong Gu, Ning Wang, Haorui Shang, Fei Yu + 2 more
'Onofrio M. Maragò'] As a universal physical scheme, effective light couplings to waveguides favor numerous applications. However, the low coupling efficiency at wide angles prohibits this fundamental functionality and thus lowers the performance levels of photonic systems. As previously found, the transmission…
Eric L. Shirley, R. U. Datla
We model diffraction errors found when using toothed apertures [L. P. Boivin, Reduction of diffraction errors in radiometry by means of toothed apertures, Appl. Opt. 17, 3323-3328 (1978)]. Using toothed (cf. circular) apertures minimizes diffraction by inducing destructive interference within the diffracted signal.…
Tsion Eisenfeld, Avi Karsenty
LENS (Light Emitting Nano-pixel Structure), a new nano-metric device, was designed, simulated, and modeled for feasibility analysis, with the challenge of combining high resolution and high brightness for display, essentially adapted for Augmented Reality (AR) and Virtual Reality. The device is made of two parts: The…
Klaus D. Mielenz
This paper focuses on unresolved or poorly documented issues pertaining to Fresnel’s scalar diffraction theory and its modifications. In Sec. 2 it is pointed out that all thermal sources used in practice are finite in size and errors can result from insufficient coherence of the optical field. A quarter-wave criterion…
Reza Hekmati, John P. Hadden, Annie Mathew, Samuel G. Bishop + 2 more
Coupling light from a point source to a propagating mode is an important problem in nano-photonics and is essential for many applications in quantum optics. Circular “bullseye” cavities, consisting of concentric rings of alternating refractive index, are a promising technology that can achieve near-unity coupling into…