Dr. Petre Catalin Logofatu Profile

Dr. Petre Catalin Logofatu

at National Inst for Laser Plasma & Radiation Physics

SPIE Involvement:

Author

Publications (47)

Proceedings Article | 14 December 2016 Paper

Real-time digital holographic interferometry set-up for phase gradient study in dynamic phase objects using spatial modulator

Adrian Sima, Paul Schiopu, Petre Logofatu

Proceedings Volume 10010, 100100R (2016) https://doi.org/10.1117/12.2245899

KEYWORDS: Digital holography, Refractive index, Spatial light modulators, Holograms, Holography, Visualization, Holographic interferometry, Water, Fringe analysis, 3D image reconstruction

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Proceedings Article | 14 December 2016 Paper

3D THz hyperspectrum applied in security check-in

V. Damian, P. C. Logofătu, T. Vasile

Proceedings Volume 10010, 100100Y (2016) https://doi.org/10.1117/12.2243276

KEYWORDS: Terahertz radiation, Hyperspectral imaging, Databases, Terahertz radiation, Databases, Information security, 3D image processing, Spatial resolution, Carbon, Image processing, Image resolution, Spectral resolution

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Proceedings Article | 14 December 2016 Paper

Assessment of illumination conditions in a single-pixel imaging configuration

Florin Garoi, Cristian Udrea, Cristian Damian, Petre Logofătu, Daniela Colţuc

Proceedings Volume 10010, 1001011 (2016) https://doi.org/10.1117/12.2243295

KEYWORDS: Reconstruction algorithms, Signal to noise ratio, Multiplexing, Image quality, Photodiodes, Sensors, Modulation, Micromirrors, Signal to noise ratio, Image processing, Digital micromirror devices

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Proceedings Article | 20 February 2015 Paper

Physical Fourier encoding and compacting of optical data

Petre Logofatu, Florin Garoi, Victor Damian, Cristian Udrea

Proceedings Volume 9258, 925810 (2015) https://doi.org/10.1117/12.2071912

KEYWORDS: Fourier transforms, Computer programming, Charge-coupled devices, CCD image sensors, Sensors, Transparency, Polarizers, Diffractive optical elements, Fourier optics, Lenses

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Proceedings Article | 20 February 2015 Paper

L1 minimization applied to two sparse signals that can be described as sums of elementary functions

Petre Logofătu

Proceedings Volume 9258, 92581B (2015) https://doi.org/10.1117/12.2071829

KEYWORDS: Digital signal processing, Bessel functions, Imaging spectroscopy, Laser processing, Plasma physics, Plasma, Physics, Optimization (mathematics), Chemical elements, Optoelectronics

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Proceedings Article | 20 February 2015 Paper

Terahertz range complex refractive index determinations for liquids using ATR

Adrian Dobroiu, Petre Logofătu

Proceedings Volume 9258, 925818 (2015) https://doi.org/10.1117/12.2072174

KEYWORDS: Prisms, Liquids, Refractive index, Terahertz radiation, Interfaces, Silicon, Optical properties, Sensors, Explosives, Mirrors

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Proceedings Article | 20 February 2015 Paper

1D hyperspectral images of a light emitting diodes array

I. Urzica (Iordache), V. Damian, P. Logofatu, D. Apostol, T. Vasile, C. Udrea

Proceedings Volume 9258, 92581C (2015) https://doi.org/10.1117/12.2072046

KEYWORDS: Hyperspectral imaging, Charge-coupled devices, Light emitting diodes, Monochromators, Imaging systems, Image processing, CCD cameras, 3D image processing, Mirrors, Diodes

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Proceedings Article | 10 June 2013 Paper

Reflectance and transmittance of a uniaxial thin film with the optic axis perpendicular to the surface

P. Logofatu

Proceedings Volume 8882, 88820N (2013) https://doi.org/10.1117/12.2032580

KEYWORDS: Polarization, Thin films, Reflection, Interfaces, Magnetism, Reflectivity, Transmittance, Maxwell's equations, Crystals, Anisotropy

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Proceedings Article | 1 November 2012 Paper

Phase-shifting interferometry with a reflective diffraction grating for adaptive optics

F. Garoi, Petre Logofatu, D. Apostol, C. Udrea

Proceedings Volume 8411, 84110R (2012) https://doi.org/10.1117/12.966844

KEYWORDS: Diffraction gratings, Wavefronts, Wavefront sensors, Phase interferometry, Deformable mirrors, Adaptive optics, Sensors, Reflectivity, Phase shifts, Interferometry

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Proceedings Article | 1 November 2012 Paper

Sampling theorem: the cornerstone of discrete optics

Petre Logofatu, Victor Nascov

Proceedings Volume 8411, 84110F (2012) https://doi.org/10.1117/12.934818

KEYWORDS: Fourier transforms, Nickel, Calculus, Physics, Detection theory, Commercial off the shelf technology, Plasma physics, Plasma, Computing systems, Optoelectronics

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SPIE Journal Paper | 1 October 2011

High diffraction order grating interferometer for pitch measurement

Dan Apostol, Cristian Udrea, Florin Garoi, Tiberius Vasile, Petre Catalin Logofatu

OE, Vol. 50, Issue 10, 105601, (October 2011) https://doi.org/10.1117/12.10.1117/1.3633332

KEYWORDS: Diffraction gratings, Interferometers, Diffraction, Interferometry, Geometrical optics, Sensors, Optical engineering, Error analysis, Physics, Image resolution

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Proceedings Article | 4 December 2010 Paper

Preliminary ellipsometric studies and tests for measuring the birefringence of electro-optic materials

Petre Logofatu, Cristian Udrea, Valentin Ion, Nicu Doinel Scărişoreanu, Raluca Műller

Proceedings Volume 7821, 782114 (2010) https://doi.org/10.1117/12.882140

KEYWORDS: Electro optics, Birefringence, Thin films, Polarizers, Polarization, Ellipsometry, Phase compensation, Thin film devices, Crystals, Optical components

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Proceedings Article | 4 December 2010 Paper

Fast diffraction computation algorithms based on FFT

Petre Logofatu, Victor Nascov, Dan Apostol

Proceedings Volume 7821, 782103 (2010) https://doi.org/10.1117/12.882138

KEYWORDS: Fourier transforms, Convolution, Diffraction, Near field diffraction, Computing systems, Algorithms, Algorithm development, Optical signal processing, Detection and tracking algorithms, Optical engineering

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SPIE Journal Paper | 1 November 2009

Lucky interferometry for displacement measurement

Bogdan Ionita, Petre-Catalin Logofatu, Dan Apostol

OE, Vol. 48, Issue 11, 115602, (November 2009) https://doi.org/10.1117/12.10.1117/1.3264960

KEYWORDS: Interferometry, Image processing, Visibility, Interferometers, Astronomy, CCD cameras, Optical engineering, Error analysis, Mirrors, Phase interferometry

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Proceedings Article | 7 January 2009 Paper

Nano-metrology of macro-systems

F. Garoi, D. Apostol, P. Schiopu, P. Logofatu, V. Damian

Proceedings Volume 7297, 72971G (2009) https://doi.org/10.1117/12.823663

KEYWORDS: Interferometers, Beam splitters, Electronics, Polarization, Photodetectors, Homodyne detection, Signal analyzers, Michelson interferometers, Reflectors, Retroreflectors

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Proceedings Article | 6 January 2009 Paper

Diffraction experiments with the spatial light modulator: the boundary between physical and digital optics

Petre Catalin Logofatu, Adrian Sima, Dan Apostol

Proceedings Volume 7297, 729704 (2009) https://doi.org/10.1117/12.823612

KEYWORDS: Diffraction, Optical signal processing, Fourier transforms, Computer generated holography, Spatial light modulators, Holograms, Modulators, Transform theory, Algorithm development, Fresnel lenses

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Proceedings Article | 5 June 2008 Paper

CALAS: Carpathian laser strainmeter: a project and preliminary results

F. Garoi, D. Apostol, V. Damian, P. Logofătu, B. Ioniţă, J. Lazar, G. Molesini, T. Papadopoulos, C. Ionescu, Andreea Ţugui

Proceedings Volume 7022, 702218 (2008) https://doi.org/10.1117/12.804106

KEYWORDS: Interferometers, Laser optics, Laser stabilization, Laser interferometry, Interferometry, Beam splitters, Physics, Geophysics, Mechanics, Earthquakes

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Proceedings Article | 1 August 2007 Paper

Characterization of surface relief gratings of submicron period

P. Logofătu, D. Apostol, Marie-Claude Castex, Ileana Apostol, V. Damian, Iuliana Iordache, Raluca Müller

Proceedings Volume 6785, 67851V (2007) https://doi.org/10.1117/12.756800

KEYWORDS: Diffraction gratings, Diffraction, Scatterometry, Printing, Databases, Refractive index, Modulation, Error analysis, Photoresist materials, Nanotechnology

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Proceedings Article | 1 August 2007 Paper

Fourier transform digital holography

Dan Apostol, Adrian Sima, Petre Logofătu, Florin Garoi, Victor Damian, Victor Nascov, Iuliana Iordache

Proceedings Volume 6785, 678522 (2007) https://doi.org/10.1117/12.756836

KEYWORDS: Digital holography, Holograms, Fourier transforms, 3D image reconstruction, Holography, Analog electronics, Image analysis, Digital cameras, Digital recording, Transparency

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Proceedings Article | 1 August 2007 Paper

Magnetic liquid surface behaviour to external stimulus

V. Damian, P. Logofatu, D. Apostol, L. Vekas, Doina Bica, A. Damian, F. Garoi, Iuliana Iordache, A. Sima, Mihaela Bojan

Proceedings Volume 6785, 678523 (2007) https://doi.org/10.1117/12.756817

KEYWORDS: Magnetism, Liquids, Actuators, Signal detection, Interferometers, Semiconductor lasers, Fabry–Perot interferometers, Digital cameras, Diffractive optical elements, Fizeau interferometers

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Proceedings Article | 1 August 2007 Paper

Static Fourier transform lambdameter

Dan Apostol, Adrian Sima, Petre Logofătu, Florin Garoi, Victor Damian, Victor Nascov, Iuliana Iordache

Proceedings Volume 6785, 678521 (2007) https://doi.org/10.1117/12.756815

KEYWORDS: Spatial frequencies, Fourier transforms, Interferometers, Spectroscopy, Semiconductor lasers, Fabry–Perot interferometers, Helium neon lasers, Charge-coupled devices, Sensors, Zoom lenses

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Proceedings Article | 18 June 2007 Paper

Structure modeling for scatterometric characterization of photoinduced surface relief gratings

Petre Logofatu, Ileana Apostol, Marie-Claude Castex, Victor Damian, Iuliana Iordache, Mihaela Bojan, Dan Apostol

Proceedings Volume 6617, 661717 (2007) https://doi.org/10.1117/12.726060

KEYWORDS: Diffraction gratings, Scatterometry, Confocal microscopy, Atomic force microscopy, Diffraction, Ultraviolet radiation, Polymers, Photoresist materials, Calibration, Photopolymers

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Proceedings Article | 8 May 2007 Paper

Refractive index measurement using comparative interferometry

Mihaela Bojan, D. Apostol, V. Damian, P. Logofatu, F. Garoi, Iuliana Iordache

Proceedings Volume 6635, 66350Q (2007) https://doi.org/10.1117/12.741908

KEYWORDS: Refractive index, Interferometry, Liquids, Solids, Thin films, Reflectivity, Water, Spatial frequencies, Optical properties, Fringe analysis

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Proceedings Article | 8 May 2007 Paper

Time-averaged vibration mode viewing with DSPI

F. Garoi, D. Apostol, A. Sima, V. Damian, P. Logofatu, V. Nascov, Iuliana Iordache, Mihaela Bojan

Proceedings Volume 6635, 66350V (2007) https://doi.org/10.1117/12.741925

KEYWORDS: Speckle, Aluminum, Speckle pattern, Beam splitters, Digital signal processing, Interferometers, Charge-coupled devices, Visualization, Speckle interferometry, CCD cameras

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Proceedings Article | 7 May 2007 Paper

Nanometrology of microsystems: traceability problem in nanometrology

Iuliana Iordache, D. Apostol, O. Iancu, G. Stanciu, P. Logofatu, V. Damian, F. Garoi, B. Savu, M. Bojan

Proceedings Volume 6635, 663503 (2007) https://doi.org/10.1117/12.741833

KEYWORDS: Interferometers, Calibration, Metrology, Interferometry, Fringe analysis, Ferroelectric materials, Standards development, Light sources, Microelectromechanical systems, Laser stabilization

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Proceedings Article | 7 May 2007 Paper

Optical encoder measurement technology

Iuliana Iordache, Mihaela Bojan, D. Apostol, V. Damian, F. Garoi, P. Logofatu, Raluca Muller, B. Savu

Proceedings Volume 6635, 663506 (2007) https://doi.org/10.1117/12.741862

KEYWORDS: Interferometers, Calibration, Atomic force microscopy, Interferometry, Light sources, Microscopes, Optical encoders, Optical testing, Laser stabilization, Helium neon lasers

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Proceedings Article | 7 May 2007 Paper

Enhancements of the Abelés method for refractive index determination

Petre Logofatu, Iuliana Iordache, Mihaela Bojan

Proceedings Volume 6635, 663507 (2007) https://doi.org/10.1117/12.741865

KEYWORDS: Refractive index, Reflectivity, Dielectrics, Thin films, Ytterbium, Interfaces, Absorption, Switches, Reflection, Silicon films

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Proceedings Article | 25 April 2007 Paper

SNR improvement of digital speckle pattern interferograms

F. Garoi, A. Sima, D. Apostol, V. Damian, P. C. Logofătu, V. Nascov, Iuliana Iordache, Ludmila Serghei, Mihaela Bojan

Proceedings Volume 6606, 660612 (2007) https://doi.org/10.1117/12.729657

KEYWORDS: Signal to noise ratio, Speckle, Aluminum, Digital filtering, Speckle pattern, Image filtering, Image processing, Charge-coupled devices, Beam splitters, Electronic filtering

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Proceedings Article | 9 June 2006 Paper

Statistical processing of Newton's rings fringe pattern using the Fresnel transform

Victor Nascov, Dan Apostol, Florin Garoi, Victor Damian, Luliana Lordache, Petre Cãtãlin Logofãtu

Proceedings Volume 6252, 62521P (2006) https://doi.org/10.1117/12.677168

KEYWORDS: Fringe analysis, Error analysis, Fourier transforms, Statistical analysis, Numerical analysis, Ferroelectric LCDs, Nickel, Chlorine, Holography, Californium

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Proceedings Article | 14 December 2005 Paper

Rigorous coupled-wave analysis for two-dimensional gratings

Petre Cătălin Logofătu

Proceedings Volume 5972, 59720Q (2005) https://doi.org/10.1117/12.639735

KEYWORDS: Dielectrics, Matrices, Maxwell's equations, Computer programming, Diffraction gratings, Dielectric polarization, Human-machine interfaces, Wave propagation, Magnetism, Electromagnetism

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Proceedings Article | 14 December 2005 Paper

Absolute measurement of length with nanometric resolution

D. Apostol, F. Garoi, A. Timcu, V. Damian, P. Logofatu, V. Nascov

Proceedings Volume 5972, 59720K (2005) https://doi.org/10.1117/12.639719

KEYWORDS: Fringe analysis, Interferometers, Error analysis, Distance measurement, Ferroelectric materials, Charge-coupled devices, Interferometry, Statistical analysis, Laser applications, Transducers

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Proceedings Article | 14 December 2005 Paper

SU 8 used as optical waveguide in integrated optical microsensor for biological applications

Raluca Műller, P. Obreja, M. Kusko, D. Esinenco, C. Tibeica, G. Conache, L. Buia, D. Apostol, V. Damian, M. Mateescu, Mirela Diaconu, Lucia Moldovan

Proceedings Volume 5972, 59720Z (2005) https://doi.org/10.1117/12.639745

KEYWORDS: Waveguides, Integrated optics, Refractive index, Cladding, Collagen, Silicon, Wave propagation, Silica, Sensors, Signal attenuation

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Proceedings Article | 14 December 2005 Paper

Interferogram analysis for flatness metrology

Victor Nascov, Adrian Timcu, Dan Apostol, Florin Garoi, Victor Damian, Iuliana Iordache, Petre Cătălin Logofătu

Proceedings Volume 5972, 59721C (2005) https://doi.org/10.1117/12.639776

KEYWORDS: Fringe analysis, Statistical analysis, Fourier transforms, Error analysis, Metrology, Spatial frequencies, Optical interferometry, Digital signal processing, Interferometry, Glasses

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Proceedings Article | 16 August 2004 Paper

Micromachined tunable optical microfilters design and experimental processing

Dana Cristea, Raluca Muller, Philippe Arguel, Mihai Kusko, Catalin Tibeica, Dimitrtis Syvridis

Proceedings Volume 5455, (2004) https://doi.org/10.1117/12.545470

KEYWORDS: Mirrors, Silicon, Photodiodes, Interferometers, Anisotropic etching, Semiconducting wafers, Reflectivity, Optical lithography, Fabry–Perot interferometers, Surface micromachining

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Proceedings Article | 2 June 2003 Paper

UV scatterometry

Petre Catalin Logofatu

Proceedings Volume 5038, (2003) https://doi.org/10.1117/12.485037

KEYWORDS: Scatterometry, Ultraviolet radiation, Sensors, Statistical analysis, Modal analysis, Optical metrology, Diffraction gratings, Reflectivity, Polarizers, Scatter measurement

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SPIE Journal Paper | 1 December 2002

Simple method for determining the fast axis of a wave plate

Petre-Catalin Logofatu

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1519242

KEYWORDS: Wave plates, Polarizers, Reflection, Surface finishing, Phase shifts, Polarization, Reflectivity, Polishing, Helium cadmium lasers, Metals

Proceedings Article | 22 August 2001 Paper

Scatterometry: a metrology for subwavelength surface-relief gratings

Petre-Catalin Logofatu, John McNeil

Proceedings Volume 4344, (2001) https://doi.org/10.1117/12.436772

KEYWORDS: Modulators, Polarizers, Scatterometry, Calibration, Phase shift keying, Modulation, Wave plates, Metrology, Statistical analysis, Phase modulation

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Proceedings Article | 22 August 2001 Paper

Measurement precision of optical scatterometry

Petre-Catalin Logofatu, John McNeil

Proceedings Volume 4344, (2001) https://doi.org/10.1117/12.436770

KEYWORDS: Scatterometry, Spectroscopy, Error analysis, Precision optics, Light sources, Metrology, Reflectivity, Polarization, Inspection, Laser stabilization

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Proceedings Article | 29 June 2001 Paper

Optical homogeneity and growth defects in sapphire crystals grown by different methods

C. Logofatu, I. Licea, N. Mincu, Cristiana Grigorescu

Proceedings Volume 4430, (2001) https://doi.org/10.1117/12.432821

KEYWORDS: Crystals, Sapphire, Refractive index, Crystal optics, Statistical analysis, Laser crystals, Absorption, Interfaces, Crystallography, Convection

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Proceedings Article | 14 June 1999 Paper

Sensitivity analysis of fitting for scatterometry

Petre-Catalin Logofatu, John McNeil

Proceedings Volume 3677, (1999) https://doi.org/10.1117/12.350805

KEYWORDS: Scatterometry, Reflectivity, Error analysis, Statistical analysis, Scatter measurement, Polarization, Semiconducting wafers, Refractive index, Microelectronics, Metrology

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Proceedings Article | 30 October 1998 Paper

Application of optical scatterometry to microelectronics and flat panel display processing

John McNeil, Stephen Coulombe, Petre-Catalin Logofatu, Christopher Raymond, S. Sohail Naqvi, George Collins

Proceedings Volume 3426, (1998) https://doi.org/10.1117/12.328456

KEYWORDS: Scatterometry, Semiconducting wafers, Scanning electron microscopy, Metrology, Microelectronics, Diffraction, Flat panel displays, Scatter measurement, Critical dimension metrology, Diffraction gratings

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Proceedings Article | 2 July 1998 Paper

Al2O3 single-crystalline substrates for optoelectronic applications

C. Logofatu, Brandusa Iliescu, Ionut Enculescu, Cristiana Grigorescu, Stefan Manea

Proceedings Volume 3405, (1998) https://doi.org/10.1117/12.312684

KEYWORDS: Crystals, Sapphire, Oxygen, Optoelectronics, Single crystal X-ray diffraction, Refractive index, Optical properties, Data modeling, Crystallography, Corundum

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Proceedings Article | 8 June 1998 Paper

Ellipsometric scatterometry for sub-0.1-um CD measurements

Stephen Coulombe, Petre-Catalin Logofatu, Babar Minhas, S. Sohail Naqvi, John McNeil

Proceedings Volume 3332, (1998) https://doi.org/10.1117/12.308737

KEYWORDS: Photoresist materials, Phase measurement, Scatterometry, Diffraction gratings, Silicon, Diffraction, Received signal strength, Reflectivity, Metrology, Scatter measurement

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SPIE Journal Paper | 1 May 1996

Sensitivity analysis of parameter determination from measurements of directly measurable quantities using the Jacobian

Dan Apostol, Petre-Catalin Logofatu, Victor Damian, Adrian Dobroiu

OE, Vol. 35, Issue 05, (May 1996) https://doi.org/10.1117/12.10.1117/1.600998

KEYWORDS: Phase shifts, Phase interferometry, Interferometry, Refractive index, Error analysis, Optical engineering, Atomic, molecular, and optical physics, Physics, Metals, Reflectivity

Proceedings Article | 8 March 1995 Paper

Large angle measurement by interferometry

Dan Apostol, Constantin Blanaru, Victor Damian, Petre-Catalin Logofatu, R. Tumbar, Adrian Dobroiu

Proceedings Volume 2461, (1995) https://doi.org/10.1117/12.203477

KEYWORDS: Interferometry, Interferometers, Data processing, Signal generators, Physics, Laser interferometry, Optical testing, Digital signal processing, Transform theory, Signal detection

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Proceedings Article | 8 March 1995 Paper

Interferometric angular transducers

Dan Apostol, Victor Damian, Petre-Catalin Logofatu, R. Tumbar, Adrian Dobroiu

Proceedings Volume 2461, (1995) https://doi.org/10.1117/12.203478

KEYWORDS: Prisms, Interferometry, Transducers, Interferometers, Metrology, Refractive index, Interfaces, Laser metrology, Mirrors, Shearing interferometers

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Proceedings Article | 8 March 1995 Paper

Refractometry by reflectometry

Dan Apostol, Alexandru Ciura, Victor Damian, Petre-Catalin Logofatu, Mihaela Stoica, R. Tumbar

Proceedings Volume 2461, (1995) https://doi.org/10.1117/12.203472

KEYWORDS: Reflectivity, Refractometry, Refractive index, Metals, Infrared radiation, Lithium, Absorption, Reflectometry, Thin films, Physics

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Showing 5 of 47 publications

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