Results 91 to 100 of about 4,320,832 (390)
Studying Focusing Properties of Graded Index Photonic Crystals Made of Material with Different Refractive Index [PDF]
Journal of Optoelectronical Nanostructures, 2017 In this paper we investigate focusing properties of graded index (GRIN) photonic crystal (PC) structures which are composed of different materials with different refractive indices. GRIN PC structure is constructed from air holes in dielectric background.
Nasrin Miri, Abdolrasoul Gharaati
doaj
Numerical modelling of light propagation in surface plasmon resonance sensor with liquid crystal
Condensed Matter Physics, 2018 The five-layer nanorod-mediated surface plasmon sensor with inhomogeneous liquid crystal layer was theoretically investigated. The reflectance as the function of the incident angle was calculated at different voltages applied to the liquid crystal (LC ...
Ye.S. Yarmoshchuk +2 more
doaj +1 more source
Sensors, 2012 Fiber-optic interferometric sensors based on graded-index multimode fibers have very high refractive-index sensitivity, as we previously demonstrated. In this paper, spatial-frequency multiplexing of this type of fiber-optic refractive index sensors is ...
Hui-Juan Wu +5 more
doaj +1 more source
Flat lens without optical axis: Theory of imaging
, 2005 We derive a general theory for imaging by a flat lens without optical axis. We show that the condition for imaging requires a material having elliptic dispersion relations with negative group refraction, equivalent to an effective anisotropic refractive ...
Lu, W. T., Sridhar, S.
core +1 more source
Highly tunable refractive index visible-light metasurface from block copolymer self-assembly
Nature Communications, 2016 The refractive index of natural transparent materials is limited to 2–3 throughout the visible wavelength range. Wider controllability of the refractive index is desired for novel optical applications such as nanoimaging and integrated photonics.
J. ·. Kim +11 more
semanticscholar +1 more source
Toughness of Confined Auxetic Foams
Advanced Engineering Materials, EarlyView.Auxetic (negative Poisson's ratio) materials offer benefits such as impact mitigation, thermal insulation, vibration damping, and reduced shear strain, although their fracture mechanics are largely unexplored. This study investigates damage initiation and propagation in confined re‐entrant auxetic foams from polyurethane via experimental ...
Adrianos E. F. Athanasiadis +3 more
wiley +1 more source
Method for Assessing the Fidelity of Optical Diffraction Tomography Reconstruction Methods
, 2019 We use a spatial light modulator in a diffraction tomographic system to assess the accuracy of different refractive index reconstruction algorithms. Optical phase conjugation principles through complex media, allows us to quantify the error for different
Ayoub, Ahmed B. +4 more
core +1 more source
Characterizing the tunable refractive index of vanadium dioxide
, 2017 Vanadium dioxide undergoes a reversible metal-insulator phase change near 68°C. This transition is often recognized for its electronic properties; however, the concomitant change in optical properties is also attractive. One application is to exploit the
M. Currie, M. Mastro, V. Wheeler
semanticscholar +1 more source
Reliable Tissue Grasping in Robotic Minimally Invasive Surgery Enabled by Optical‐Based Slip Sensing
Advanced Engineering Materials, EarlyView.An optical‐based slip sensing method using a complementary metal–oxide–semiconductor image sensor with a built‐in infrared light emitting diode enables real‐time detection of tissue slippage—including displacement, direction, and speed—in robotic minimally invasive surgery.
Minjae Lee, Amy Kyungwon Han
wiley +1 more source
Tecnura, 2017 Objectives: The present study focused on the development of a optic fiber sensor for carbon dioxide (CO2), the measuring of variations of the refractive index of a CO2 medium undergoing controlled changes of temperature and pressure, and comparing this ...
María Angélica Acosta Pérez +2 more
doaj