<p>Currently, III-V antimonide-based detector technology is under strong development as a possible alternative to HgCdTe material systems. The apparent rapid success of a broken-gap type-II superlattice (T2SL) depends not only on the previous five decades of development of III-V materials, but mainly on recent ideas in the design of infrared photodetectors. The ability to tune the positions of the conduction and valence band edges independently in the T2SL is especially helpful in the design of unipolar barriers. Unipolar barriers are used to implement the barrier detector architecture for increasing the collection efficiency of photogenerated carriers and reducing dark current originating within the depletion region without inhibiting photocurrent flow. During the last decade, antimonide-based focal plane array technology has achieved a level close to HgCdTe. However, the modern version of the technology is still in its infancy. The advent of bandgap engineering has given III-Vs a new lease on life. This book describes current concepts of antimonide-based IR detectors, focusing on designs having the largest impact on the mainstream of IR detector technologies. It is suitable for graduate students in physics and engineering who have knowledge of modern solid-state physics and electronic circuits, and will be of interest to those working with aerospace sensors and systems, remote sensing, thermal imaging, military imaging, optical telecommunications, infrared spectroscopy, and lidar.</p>

Antimonide-based Infrared Detectors: A New Perspective

Science & Math

Malgorzata

Kopytko

Martyniuk

Piotr Marcin

Rogalski

Antoni

Physics

SPIE--The International Society for Optical Engineering

L'intangible

ORIGINEL ACCARI

<p>Admired by experts and laymen alike, Antoni Gaudi (1852-1926) is considered to be one of the great architects of all time. In each of his fantastic works he knew how to apply revolutionary ideas that have provided formal and structural innovations universally employed in twentieth century architecture. Gaudi is the best known practitioner of Catalan Modernism. Gaudí's works reflect an individualized and distinctive style. Most are located in Barcelona, including his magnum opus, the Sagrada Família. Gaudí's work was influenced by his passions in life: architecture, nature, and religion. Gaudí considered every detail of his creations and integrated into his architecture such crafts as ceramics, stained glass, wrought ironwork forging and carpentry. He also introduced new techniques in the treatment of materials, such as trencadís which used waste ceramic pieces. Under the influence of neo-Gothic art and Oriental techniques, Gaudí became part of the Modernista movement which was reaching its peak in the late 19th and early 20th centuries. His work transcended mainstream Modernisme, culminating in an organic style inspired by natural forms. Gaudí rarely drew detailed plans of his works, instead preferring to create them as three-dimensional scale models and molding the details as he conceived them. Gaudí's work enjoys global popularity and continuing admiration and study by architects. His masterpiece, the still-incomplete Sagrada Família, is the most-visited monument in Spain. Between 1984 and 2005, seven of his works were declared World Heritage Sites by UNESCO. Gaudí's Roman Catholic faith intensified during his life and religious images appear in many of his works. This earned him the nickname "God's Architect" and led to calls for his beatification.</p>

Guía visual de la obra completa de Antoni Gaudí - INGLES

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