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Microlenses for optical microsystems
Rocha, R. P.Tese de doutoramento (Programa Doutoral em Líderes para as Indústrias Tecnológicas) ; Lenses have been used by mankind for thousands of years for innumerous different reasons and applications. More recently, lenses in the micro scale dimension, so called microlenses (MLs), have been designed and fabricated using semiconductor technology. These new lenses are used for collimation, focusing or imaging and are an...
Photonic sensors based on flexible materials with FBGs for use on biomedical ap...
Silva, A. F.; Rocha, R. P.; Carmo, J. P.; Correia, J. H.This chapter is intended for presenting biomedical applications of FBGs embedded into flexible carriers for enhancing the sensitivity and to provide interference-free instrumentation.
Microlenses for stereoscopic image formation
Rocha, R. P.; Carmo, J. P.; Correia, J. H.This paper presents microlenses for integration on a stereoscopic image sensor in CMOS technology for use in biomedical devices. It is intended to provide an image sensor with a stereoscopic vision. An array of microlenses potentiates stereoscopic vision and maximizes the color fidelity. An array of optical filters tuned at the primary colors will enable a multicolor usage. The material selected for fabricating...
Polichromatic image sensor with microlenses for stereoscopic acquisition
Rocha, R. P.; Carmo, J. P.; Correia, J. H.; Silva, M. F.This paper presents the fabrication of microlenses for integration on a stereoscopic image sensor in CMOS technology and a low-cost technology for fabricating optical filters arrays tuned for the primary colors. The material selected for fabricating the microlens was the AZ4562 positive photoresist and the fabrication process explained. Moreover, the fabrication process presented in this paper is for directly p...
Fabrication methodology of microlenses for stereoscopic imagers using standard ...
Rocha, R. P.; Carmo, J. P.; Correia, J. H.This paper presents the fabrication technology of microlenses maintaining a high reproducibility of their characteristics with low cost. The objective of microlenses is to be integrated into imagers in CMOS technology to allow stereoscopic vision. The fabricated microlenses form cylindrical arrays to be placed above the optical filters and photodetectors, in order to potentiate stereoscopic vision and at the sa...
Microlenses array made with AZ4562 photoresist for stereoscopic acquisition
Rocha, R. P.; Carmo, J. P.; Gomes, J. M.; Belsley, M.; Correia, J. H.In this paper is presented a fabrication process for obtaining refractive microlenses arrays with high reproducibility and low cost. This process was specifically optimized for the AZ4562 photoresist. Functional prototypes of microlenses arrays with dimensions in the range of 30 m, 4.9 mm and 5 m for width, length and thickness, respectively, were fabricated and tested. The pre-thermal reflow spacing between ...
Fabrication of AZ4562 refractive microlenses array for light enhancement on opt...
Rocha, R. P.; Carmo, J. P.; Correia, J. H.; Gomes, J. M.This paper presents the fabrication of an array of high aspect ratio photoresist based refractive microlenses (ML) using photolithography and thermal reflow. First, and in order to evaluate and predict the MLs optical properties and physical dimensions, finite element analysis was done. These simulations helped to design the super high resolution chrome on soda lime glass photomask as well as the parameters for...
Thermoelectric micro converters for cooling and energy scavenging systems
Gonçalves, L. M.; Silva, A. F.; Alpuim, P.; Rocha, R. P.; Correia, J. H.; Couto, Carlos; Silva, H. R.This paper describes the fabrication process of thermoelectric microconverters, based on n-type bismuth telluride (Bi2Te3) and p-type antimony telluride (Sb2Te3) thin films. Materials are fabricated by thermal co-evaporation with thermoelectric properties comparable to those reported for the same materials in bulk form (used in conventional macro-scale Peltier modules). Absolute value of Seebeck coefficient in ...
Global database views in a federation of autonomous databases
Castilho,J. M. V. de; Rocha,R. P. da; Härder,T.; Thomas,J.The Institute of Computer Science of the Federal University of Rio Grande do Sul is participating in a project to develop a computer system infrastructure for supporting the Brazilian health ministry’s SUS (Sistema Unificado de Saude) program. In order to construct this heterogeneous system, we have to start from existing information sources (possibly "legacy") and their services and gradually integrate them wi...
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