نتایج جستجو برای: near zero refractive index

تعداد نتایج: 790784  

Journal: :Physical review letters 2006
Maria L Calvo P Cheben O Martínez-Matos F del Monte J A Rodrigo

We report observations of periodic oscillatory behavior of the angular selectivity, near the Bragg angle, in volume holographic gratings recorded in a new photopolymerizable glass with high refractive index modulation. We have detected the presence of overmodulation in the intensity distribution of the first diffraction order. The results reported here were achieved by incorporating in the phot...

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. The holes radii are varied in the normal direction to the propagation in such a way that a parabolic effective refractive index is produced. ...

2005
Andrea L. Martin Akil Srinivasan Deniz K. Armani Bumki Min Kerry J. Vahala

Replica molding of ultra-high-Q toroidal microresonators can produce polymer microresonators with material-limited quality factors (Q). This was demonstrated previously using polymers which cure thermally. In this work, high Q polymer microresonators were fabricated using the replica molding technique from previously uncharacterized polymers which require either a thermal or UV cure. The qualit...

2011
Qing Tan Armando Cosentino Matthieu Roussey Peter Herzig

We present the simulation, fabrication, and characterization of ametallic slot grating on a siliconwaveguide (30nm slot width for a period of 500nm). According to the simulation, the experimental measured spectrum of the structure exhibits a dip in the near-infrared region. Moreover, the finite-difference time-domain simulation shows that this device can be used as a sensor, due to its high sen...

2015
Iltai (Isaac) Kim Kenneth David Kihm

Nanophotonic technique has been attracting much attention in applications of nano-bio-chemical sensing and energy conversion of solar energy harvesting and enhanced energy transfer. One approach for nano-bio-chemical sensing is surface plasmon resonance (SPR) imaging, which can detect the material properties, such as density, ion concentration, temperature, and effective refractive index in hig...

2017
Zhonghua Wang Ning An Fei Shen Hongping Zhou Yongxuan Sun Zhaoneng Jiang Yanhua Han Yan Li Zhongyi Guo

Dielectric nanoparticles can demonstrate a strong forward scattering at visible and near-infrared wavelengths due to the interaction of optically induced electric and magnetic dipolar resonances. For a spherical nanoparticle, the first Kerker's condition within dipole approximation can be realized, where backward scattering can reach zero. However, for this type of dielectric sphere, maximum fo...

Journal: :Physics in medicine and biology 2003
Hamid Dehghani Ben Brooksby Karthik Vishwanath Brian W Pogue Keith D Paulsen

Near-infrared (NIR) tomography is a technique used to measure light propagation through tissue and generate images of internal optical property distributions from boundary measurements. Most popular applications have concentrated on female breast imaging, neonatal and adult head imaging, as well as muscle and small animal studies. In most instances a highly scattering medium with a homogeneous ...

2015
Coralie Fouquet Jean-François Gilles Nicolas Heck Marc Dos Santos Richard Schwartzmann Vidjeacoumary Cannaya Marie-Pierre Morel Robert Stephen Davidson Alain Trembleau Susanne Bolte

Resolution, high signal intensity and elevated signal to noise ratio (SNR) are key issues for biologists who aim at studying the localisation of biological structures at the cellular and subcellular levels using confocal microscopy. The resolution required to separate sub-cellular biological structures is often near to the resolving power of the microscope. When optimally used, confocal microsc...

2003
Alexander Sinyuk Omar Torres Oleg Dubovik

[1] We present a method for the retrieval of the imaginary part of refractive index of desert dust aerosol at near UV wavelengths. The method uses observations of radiances at 331 and 360 nm by the Total Ozone Mapping Spectrometer, and aerosol optical depth measurements by the Aerosol Robotic Network. The derived values of imaginary part of refractive index of Saharan dust aerosol at 360 nm are...

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