Prof. Luiz G. Neto Profile

Prof. Luiz G. Neto

Professor at Univ de São Paulo

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 19 October 2012 Paper

Low-cost Fresnel microlens array fabricated by a home-built maskless lithography system

G. Cirino, S. Lopera, A. Montagnoli, L. Neto, R. Mansano

Proceedings Volume 8489, 848908 (2012) https://doi.org/10.1117/12.928819

KEYWORDS: Microlens array, Wavefront sensors, Glasses, Photoresist materials, Ultraviolet radiation, Maskless lithography, Silicon, Digital micromirror devices, Optical lithography, Lithography

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Proceedings Article | 9 May 2012 Paper

Low f-number microlens array fabricated in thick resist

Giuseppe Cirino, Arlindo Montagnoli, Patrick Verdonck, Luiz Neto

Proceedings Volume 8428, 842819 (2012) https://doi.org/10.1117/12.914417

KEYWORDS: Photomasks, Microlens array, Diffraction, Photoresist processing, Transmittance, Printing, Geometrical optics, Absorption, Lithography, Interfaces

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SPIE Journal Paper | 1 September 2009

Phase-only optical encryption based on the zeroth-order phase-contrast technique

José Carlos Pizolato, Luiz Neto

OE, Vol. 48, Issue 09, 098201, (September 2009) https://doi.org/10.1117/12.10.1117/1.3223629

KEYWORDS: Image encryption, Spatial light modulators, Optical correlators, Iris, Optical image encryption, Fourier transforms, Computer programming, 3D image reconstruction, Modulation, Optical engineering

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Proceedings Article | 8 September 2006 Paper

Design, fabrication, and characterization of Fresnel lens array with spatial filtering for passive infrared motion sensors

Giuseppe Cirino, Robson Barcellos, Spero Morato, Allan Bereczki, Luiz Neto

Proceedings Volume 6343, 634323 (2006) https://doi.org/10.1117/12.707928

KEYWORDS: Sensors, Infrared sensors, Positron emission tomography, Target detection, Fresnel lenses, Point spread functions, Infrared radiation, Laser marking, Laser engraving, Pyroelectric detectors

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A cubic-phase distribution is applied in the design, fabrication and characterization of inexpensive Fresnel lens arrays for passive infrared motion sensors. The resulting lens array produces a point spread function (PSF) capable of distinguish the presence of humans from pets by the employment of the so-called wavefront coding method. The cubic phase distribution used in the design can also reduce the optical aberrations present in the system. This aberration control allows a high tolerance in the fabrication of the lenses and in the alignment errors of the sensor. In order to proof the principle, a lens was manufactured on amorphous hydrogenated carbon thin film, by well-known micro fabrication process steps. The optical results demonstrates that the optical power falling onto the detector surface is attenuated for targets that present a mass that is horizontally distributed in space (e.g. pets) while the optical power is enhanced for targets that present a mass vertically distributed in space (e.g. humans). Then a mould on steel was fabricated by laser engraving, allowing large-scale production of the lens array in polymeric material. A polymeric lens was injected and its optical transmittance was characterized by Fourier Transform Infrared Spectrometry technique, which has shown an adequate optical transmittance in the 8-14 μm wavelength range. Finally the performance of the sensor was measured in a climate-controlled test laboratory constructed for this purpose. The results show that the sensor operates normally with a human target, with a 12 meter detection zone and within an angle of 100 degrees. On the other hand, when a small pet runs through a total of 22 different trajectories no sensor trips are observed. The novelty of this work is the fact that the so-called pet immunity function was implemented in a purely optical filtering. As a result, this approach allows the reduction of some hardware parts as well as decreasing the software complexity, once the information about the intruder is optically processed before it is transduced by the pyroelectric sensor.

SPIE Journal Paper | 1 November 2004

Implementation of Fresnel full complex-amplitude digital holograms

Luiz Neto, Patricia Cardona, Giuseppe Cirino, Ronaldo Mansano, Patrick Verdonck

OE, Vol. 43, Issue 11, (November 2004) https://doi.org/10.1117/12.10.1117/1.1805566

KEYWORDS: Holograms, Phase shift keying, Modulation, Diffractive optical elements, Diffraction, Near field optics, Carbon, Amplitude modulation, Digital holography, 3D image reconstruction

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Proceedings Article | 12 April 2004 Paper

Optical implementation of image encryption using the zero-order phase-contrast technique

Jose Carlos Pizolato, Luiz Neto

Proceedings Volume 5437, (2004) https://doi.org/10.1117/12.542461

KEYWORDS: Image encryption, Spatial light modulators, Computer programming, Phase contrast, Optical correlators, Optical image encryption, Image restoration, Spatial filters, Modulation, Fourier transforms

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Proceedings Article | 12 April 2004 Paper

Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors

Giuseppe Cirino, Luiz Neto, Ronaldo Mansano

Proceedings Volume 5405, (2004) https://doi.org/10.1117/12.542655

KEYWORDS: Sensors, Infrared sensors, Positron emission tomography, Lenses, Point spread functions, Carbon, Fresnel lenses, Etching, Infrared radiation, Wavefronts

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Proceedings Article | 29 December 2003 Paper

Design of continuous full-complex modulation proximity printing masks using a quadratic phase distribution

Luiz Neto, Giuseppe Cirino, Ronaldo Mansano, Patrick Verdonck, Antonio Seabra

Proceedings Volume 5347, (2003) https://doi.org/10.1117/12.524564

KEYWORDS: Phase shift keying, Photomasks, Amplitude modulation, Modulation, Printing, Geometrical optics, Silica, Diffraction, Light wave propagation, Lithography

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SPIE Journal Paper | 1 April 2003

Design, fabrication, and characterization of a full complex-amplitude modulation diffractive optical element

Luiz Neto, Patricia Cardona, Giuseppe Cirino, Ronaldo Mansano, Patrick Verdonck

JM3, Vol. 2, Issue 02, (April 2003) https://doi.org/10.1117/12.10.1117/1.1562930

KEYWORDS: Diffractive optical elements, Modulation, Phase shift keying, Holograms, Optical components, Chemical elements, Carbon, Etching, Near field optics, Photomasks

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Proceedings Article | 1 April 2003 Paper

Design of cubic-phase distribution lenses for passive infrared motion sensors

Giuseppe Cirino, Luiz Neto

Proceedings Volume 5073, (2003) https://doi.org/10.1117/12.487786

KEYWORDS: Sensors, Infrared sensors, Lenses, Positron emission tomography, Point spread functions, Infrared radiation, Imaging systems, Pyroelectric detectors, Wavefronts, Target detection

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Proceedings Article | 17 January 2003 Paper

Hybrid phase and amplitude modulation proximity printing mask fabricated on DLC and SiO2 substrates

Luiz Neto, Giuseppe Cirino, Ronaldo Mansano, Patricia Cardona, Patrick Verdonck

Proceedings Volume 4984, (2003) https://doi.org/10.1117/12.477830

KEYWORDS: Photomasks, Phase shift keying, Printing, Modulation, Amplitude modulation, Silica, Etching, Ultraviolet radiation, Lithography, Plasma etching

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Proceedings Article | 13 November 2001 Paper

Fabrication of microlens arrays and gratings with a Novolak-type polymer

Giuseppe Cirino, Luiz Neto, A. Mousinho, Ronaldo Mansano, Patrick Verdonck, Antonio Seabra

Proceedings Volume 4437, (2001) https://doi.org/10.1117/12.448161

KEYWORDS: Polymers, Microlens, Diffraction, Photomasks, Microelectronics, Microlens array, Photoresist materials, Manufacturing, Lenses, Lithography

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Proceedings Article | 13 November 2001 Paper

Novel full complex-amplitude modulation diffractive optical element

Luiz Neto, Patricia Cardona, Giuseppe Cirino, Ronaldo Mansano, Patrick Verdonck

Proceedings Volume 4437, (2001) https://doi.org/10.1117/12.448160

KEYWORDS: Diffractive optical elements, Modulation, Holograms, Carbon, Phase shift keying, Etching, Optical design, Amplitude modulation, Glasses, Photomasks

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Proceedings Article | 14 August 2001 Paper

Novel full complex-amplitude modulation diffractive optical element

Luiz Neto, Patricia Cardona, Giuseppe Cirino, Ronaldo Mansano, Patrick Verdonck

Proceedings Volume 4419, (2001) https://doi.org/10.1117/12.437222

KEYWORDS: Modulation, Diffractive optical elements, Phase shift keying, Amplitude modulation, Wavefronts, Phase modulation, Reflectivity, Carbon, Lithography, Optical components

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Proceedings Article | 4 August 2000 Paper

Laser triangulation range finder based on a chaotic modulation and detection system

Mario Stefani, Jose Pizolato, Luiz Neto

Proceedings Volume 4052, (2000) https://doi.org/10.1117/12.395083

KEYWORDS: Laser range finders, Modulation, Oscillators, Clocks, Signal generators, Semiconductor lasers, Optical amplifiers, Diodes, Linear filtering, Sensors

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Proceedings Article | 24 May 2000 Paper

Increasing the optical coupling efficiency of planar photodetectors: electron beam writing of an integrated microlens array on top of an MSM device

Antonio Seabra, F. Araes, Murilo Romero, Luiz Neto, Bahram Nabet

Proceedings Volume 4089, (2000) https://doi.org/10.1117/12.386781

KEYWORDS: Microlens array, Photodetectors, Metals, Gallium arsenide, Semiconductors, Integrated optics, Microlens, Electron beams, Sensors, Lenses

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Proceedings Article | 19 July 1999 Paper

Multiple-line generation over high angle using hybrid parabolic profile and binary surface-relief phase element

Luiz Neto, Luciana Brassolatti Roberto, Patrick Verdonck, Ronaldo Mansano, Giuseppe Cirino, Mario Stefani

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354847

KEYWORDS: Binary data, Holograms, Computer generated holography, Quartz, Diffractive optical elements, Diffraction, Semiconducting wafers, 3D image reconstruction, Etching, Optical components

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Proceedings Article | 23 March 1998 Paper

Implementation of image encryption using the phase-contrast technique

Luiz Neto

Proceedings Volume 3386, (1998) https://doi.org/10.1117/12.304774

KEYWORDS: Image encryption, Spatial light modulators, Image restoration, Phase shift keying, Computer programming, Photomasks, Optical image encryption, Phase contrast, Optical correlators, Modulation

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Proceedings Article | 27 March 1997 Paper

Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram

Luiz Neto, Yunlong Sheng

Proceedings Volume 3073, (1997) https://doi.org/10.1117/12.270387

KEYWORDS: Holograms, Image encryption, Spatial light modulators, 3D image reconstruction, Image restoration, Lenses, Fourier transforms, Optical image encryption, Optical design, Image analysis

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SPIE Journal Paper | 1 September 1996

Optical implementation of image encryption using random phase encoding

Luiz Neto, Yunlong Sheng

OE, Vol. 35, Issue 09, (September 1996) https://doi.org/10.1117/12.10.1117/1.600848

KEYWORDS: Image encryption, Computer generated holography, Fourier transforms, Speckle, Image restoration, Computer programming, Optical image encryption, Spatial light modulators, Computer simulations, Deconvolution

Proceedings Article | 9 August 1996 Paper

Phase-only SLMs for optical pattern recognition and security systems

Yunlong Sheng, Luiz Goncalves Neto, Danny Roberge, Lixin Shen, Giles Paul Hus

Proceedings Volume 10287, 1028707 (1996) https://doi.org/10.1117/12.259698

KEYWORDS: Spatial light modulators, Optical pattern recognition, Phase shift keying, Computer security, Optical filters, Digital filtering, Phase only filters, Computer generated holography, Modulation, Amplitude modulation

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Proceedings Article | 28 March 1995 Paper

Full-complex modulation spatial light modulator using two coupled-mode modulation liquid crystal televisions

Danny Roberge, Luiz Neto, Yunlong Sheng

Proceedings Volume 2490, (1995) https://doi.org/10.1117/12.205800

KEYWORDS: Phase shift keying, Modulation, Amplitude modulation, Transmittance, Phase modulation, Holograms, Polarizers, Spatial light modulators, Liquid crystals, Interferometers

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Proceedings Article | 5 August 1994 Paper

Optical pattern-recognition with the real-time phase only filters and wavelet matched filters

Yunlong Sheng, Danny Roberge, Luiz Neto, Lixin Shen, Gilles Paul-Hus

Proceedings Volume 2321, (1994) https://doi.org/10.1117/12.182104

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Proceedings Article | 1 March 1994 Paper

Optical real-time kinoform using liquid crystal television and iterative design

Luiz Neto, Yunlong Sheng

Proceedings Volume 2237, (1994) https://doi.org/10.1117/12.169423

KEYWORDS: Phase shift keying, Computer generated holography, Holograms, 3D image reconstruction, Modulation, Liquid crystals, Phase modulation, Amplitude modulation, Diffraction, Televisions

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Showing 5 of 24 publications

Conference Committee Involvement (4)

Micromachining Technology for Micro-optics and Nano-optics V

23 January 2007 | San Jose, California, United States

Micromachining Technology for Micro-Optics and Nano-Optics IV

23 January 2006 | San Jose, California, United States

Micromachining Technology for Microoptics and Nanooptics III

25 January 2005 | San Jose, California, United States

Micromachining Technology for Microoptics and Nanooptics II

28 January 2004 | San Jose, California, United States

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