Daniel Hill

Dr. Daniel Hill

orcid

Research Focus & Metrics

Academic Career Length

36Years (1991-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2008 in Optics Express
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Journal Article
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GMGuillaume Maire
Guillaume Maire
LVLaurent Vivien
Laurent Vivien
GSGuillaume Sattler
Guillaume Sattler
Andrzej KaźmierczakAndrzej Kaźmierczak
Andrzej Kaźmierczak
BSBenito Sanchez
Benito Sanchez
DHDaniel Hill
Daniel Hill
High efficiency surface grating couplers for silicon nitride waveguides have been designed, fabricated, and characterized. Coupling efficiencies exceeding 60% are reported at a wavelength of 1.31 µm, as well as angular and wavelength -3 dB tolerances of 4° and 50 nm, respectively. When the wavelength is increased from 1310 nm to 1450 nm the coupling efficiency progressively decreases but remains above 20% at 1450 nm. The influence of the duty ratio of the grating has also been investigated: maximum coupling efficiency was obtained at 50% duty ratio.

13 October 2008 in Optics Express
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Journal Article
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LVLaurent Vivien
Laurent Vivien
DMDelphine Marris-Morini
Delphine Marris-Morini
AGAmadeu Griol
Amadeu Griol
KGKristinn Gylfason
Kristinn Gylfason
DHDaniel Hill
Daniel Hill
ECEric Cassan
Eric Cassan
Optics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.

7 December 2011 in Optics Express
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JÁJesús Álvarez
Jesús Álvarez
PBPaolo Bettotti
Paolo Bettotti
ISIsaac Suárez
Isaac Suárez
NKNeeraj Kumar
Neeraj Kumar
DHDaniel Hill
Daniel Hill
Juan Martínez PastorJuan Martínez Pastor
Juan Martínez Pastor
In this work anisotropic porous silicon is investigated as a material for optical sensing. Birefringence and sensitivity of the anisotropic porous silicon membranes are thoroughly studied in the framework of Bruggeman model which is extended to incorporate the influence of environment effects, such as silicon oxidation. The membranes were also characterized optically demonstrating sensitivity as high as 1245 nm/RIU at 1500 nm. This experimental value only agrees with the theory when it takes into consideration the effect of silicon oxidation. Furthermore we demonstrate that oxidized porous silicon membranes have optical parameters with long term stability. Finally, we developed a new model to determine the contribution of the main depolarization sources to the overall depolarization process, and how it influences the measured spectra and the resolution of birefringence measurements.

25 May 2001 in Nanotechnology
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Journal Article
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XBX Blasco
X Blasco
DHDaniel Hill
Daniel Hill
MPMarc Porti
Marc Porti
MNMontserrat Nafria
Montserrat Nafria
XAX Aymerich
X Aymerich

20 March 2013 in Optics Letters
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JÁJesús Álvarez
Jesús Álvarez
CSCarlos Serrano
Carlos Serrano
DHDaniel Hill
Daniel Hill
Juan Martínez PastorJuan Martínez Pastor
Juan Martínez Pastor
We report on the demonstration of real-time refractive index sensing within 60 μm thick free-standing macroporous alumina membranes with pore diameters of 200 nm. The free-standing macroporous alumina membranes allow the analytes to flow through the pores for targeted delivery, resulting in fast sensing responses. The polarimetric measurement platform exploits the optical anisotropy of the membranes in monitoring the refractive index variations of the analytes that fill the pores, providing highly sensitive and real-time measurements. The experimental characterization of the membranes’ birefringence at wavelengths of 808, 980, and 1500 nm showed a decrease in birefringence for shorter wavelengths caused by the depolarization process that takes place when polarized light passes through a porous medium. Volumetric sensing experiments performed at the same wavelengths demonstrated detection limits of 8.1×10−6, 5.2×10−6, and 6×10−6 refractive index units at wavelengths of 808, 980, and 1500 nm, respectively.

1 April 1991 in Physics Letters B
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Journal Article
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MBM. Beddo
M. Beddo
GBG. Burleson
G. Burleson
JFJ.A. Faucett
J.A. Faucett
SGS. Gardiner
S. Gardiner
GKG. Kyle
G. Kyle
PKP. Kroll
P. Kroll