نتایج جستجو برای: near infrared absorption

تعداد نتایج: 446298  

Journal: :The journal of physical chemistry letters 2013
Alexander A Govyadinov Iban Amenabar Florian Huth P Scott Carney Rainer Hillenbrand

Scattering-type scanning near-field optical microscopy (s-SNOM) and Fourier transform infrared nanospectroscopy (nano-FTIR) are emerging tools for nanoscale chemical material identification. Here, we push s-SNOM and nano-FTIR one important step further by enabling them to quantitatively measure local dielectric constants and infrared absorption. Our technique is based on an analytical model, wh...

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Journal: :Journal of Applied Physics 2014

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Journal: :Vision Research 1997

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Journal: :Journal of AOAC INTERNATIONAL 2001

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Journal: :Acta Polymerica Sinica 2012

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2015
Takumi Kinoshita Kazuteru Nonomura Nam Joong Jeon Fabrizio Giordano Antonio Abate Satoshi Uchida Takaya Kubo Sang Il Seok Mohammad Khaja Nazeeruddin Anders Hagfeldt Michael Grätzel Hiroshi Segawa

The extension of the light absorption of photovoltaics into the near-infrared region is important to increase the energy conversion efficiency. Although the progress of the lead halide perovskite solar cells is remarkable, and high conversion efficiency of >20% has been reached, their absorption limit on the long-wavelength side is ∼800 nm. To further enhance the conversion efficiency of perovs...

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Journal: :Optics letters 1998
D W Vernooy V S Ilchenko H Mabuchi E W Streed H J Kimble

Measurements of the quality factor Q approximately 8x10(9) are reported for the whispering-gallery modes (WGM's) of quartz microspheres for the wavelengths 670, 780, and 850 nm; these results correspond to finesse f approximately 2.2x10(6) . The observed independence of Q from wavelength indicates that losses for the WGM's are dominated by a mechanism other than bulk absorption in fused silica ...

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Journal: :The Analyst 2009
W Denzer M L Hamilton G Hancock M Islam C E Langley R Peverall G A D Ritchie

A fibre coupled near-infrared superluminescent light emitting diode that emits approximately 10 mW of radiation between 1.62 and 1.7 microm is employed in combination with a broad-band cavity enhanced spectrometer consisting of a linear optical cavity with mirrors of reflectivity approximately 99.98% and either a dispersive near-infrared spectrometer or a Fourier transform interferometer. Resul...

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2014
Jessica R. Piper Shanhui Fan

We numerically demonstrate total absorption in graphene in the near-infrared and visible wavelength ranges by means of critical coupling with guided resonances of a photonic crystal slab. In this wavelength range, there is no plasmonic response in undoped graphene, so the critical coupling is entirely controlled by the properties of the photonic crystal resonance. We discuss the general theory ...

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2014
Jeffrey T. Petty David A. Nicholson Orlin O. Sergev Stuart K. Graham

Silver clusters with ~10 atoms form within DNA strands, and the conjugates are chemical sensors. The DNA host hybridizes with short oligonucleotides, and the cluster moieties optically respond to these analytes. Our studies focus on how the cluster adducts perturb the structure of their DNA hosts. Our sensor is comprised of an oligonucleotide with two components: a 5'-cluster domain that comple...

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