3,964 research outputs found
Silicon- and Graphene-based FETs for THz technology
[EN] This Thesis focuses on the study of the response to Terahertz (THz) electromagnetic
radiation of different silicon substrate-compatible FETs. Strained-Si MODFETs, state-of-
the-art FinFETs and graphene-FETs were studied.
The first part of this thesis is devoted to present the results of an experimental and
theoretical study of strained-Si MODFETs. These transistors are built by epitaxy of
relaxed-SiGe on a conventional Si wafer to permit the fabrication of a strained-Si electron
channel to obtain a high-mobility electron gas. Room temperature detection under
excitation of 0.15 and 0.3 THz as well as sensitivity to the polarization of incoming
radiations were demonstrated. A two-dimensional hydrodynamic-model was developed to
conduct TCAD simulations to understand and predict the response of the transistors. Both
experimental data and TCAD results were in good agreement demonstrating both the
potential of TCAD as a tool for the design of future new THz devices and the excellent
performance of strained-Si MODFETs as THz detectors (75 V/W and 0.06 nW/Hz0.5).
The second part of the Thesis reports on an experimental study on the THz behavior of
modern silicon FinFETs at room temperature. Silicon FinFETs were characterized in the
frequency range 0.14-0.44 THz. The results obtained in this study show the potential of
these devices as THz detectors in terms of their excellent Responsivity and NEP figures
(0.66 kV/W and 0.05 nW/Hz0.5).
Finally, a large part of the Thesis is devoted to the fabrication and characterization of
Graphene-based FETs. A novel transfer technique and an in-house-developed setup were
implemented in the Nanotechnology Clean Room of the USAL and described in detail in
this Thesis. The newly developed transfer technique enables to encapsulate a graphene
layer between two flakes of h-BN. Raman measurements confirmed the quality of the
fabricated graphene heterostructures and, thus, the excellent properties of encapsulated
graphene. The asymmetric dual grating gate graphene FET (ADGG-GFET) concept was
introduced as an efficient way to improve the graphene response to THz radiation. High
quality ADGG-GFETs were fabricated and characterized under THz radiation. DC
measurements confirmed the high quality of graphene heterostructures as it was shown
on Raman measurements. A clear THz detection was found for both 0.15 THz and 0.3
THz at 4K when the device was voltage biased either using the back or the top gate of the
G-FET. Room temperature THz detection was demonstrated at 0.3 THz using the
ADGG-GFET. The device shows a Responsivity and NEP around 2.2 mA/W and 0.04
nW/Hz0.5 respectively at respectively at 4K.
It was demonstrated the practical use of the studied devices for inspection of hidden
objects by using the in-house developed THz imaging system
Crisis de la modernidad y filosofías ibéricas
Reseña del libro: Mora García, José Luis, et al. (eds). Crisis de la modernidad y filosofías ibéricas: X Jornadas Internacionales de Hispanismo Filosófico. Madrid: Fundación Ignacio Larramendi; Departamento de Filosofía. Universidad de Santiago de Compostela; Asociación de Hispanismo Filosófico, 201
La aportación de José María Díez-Alegría a las conversaciones de Gredos: "En la verdad arraiga la alegría"
José María de Llanos, un jesuita fundador. 25 años de ausencia
Dentro del jesuita José María de Llanos, convivían el conflicto y la paz al mismo tiempo, el recuerdo afable de los demás con el hastío superador de sí mismo, comenzando proyectivamente su frenética y abundante etapa de fundar, que él mismo definirá como el “galope de las fundaciones universitarias y franquistas”. Fundaciones que le llevarán finalmente a irse al Pozo de la hondura obrera, de la miseria descarriada, del estiércol.Within the Jesuit Jose Maria de Llanos, conflict and peace coexisted at the same time, the affable remembrance of others with the self-surpassing boredom, projectively beginning his frenetic and abundant stage of founding, which he himself will define as the "gallop Of the university foundations and Franco ". Foundations that will finally lead him to go to the Well of the working depths, the miserable misery, the dung.peerReviewe
Proceso contra la violencia. Condiciones fundamentales para el establecimiento de un orden de paz y buena voluntad
The main objective of this paper is to question the real and true reasoning of the value
and dignity of the human person and respect of their rights and freedoms in political
totalitarianism. The ultimate motivation for all these approaches responds to stimuli and
evaluations of the meaning and scope fully humanistic and democratic. It is an approach on the way to feel, speak, think and act with a strong respect for the individual within a
democratic coordinates. Above the design philosophy is a philosophy existential
experience, ie no uptake in human beings more intelligent than purely conceptual. The
brain works on reality, but existential experiences, feelings, knowledge in a deep sense.El objetivo fundamental de esta comunicación es plantear un auténtico y verdadero
razonamiento del valor y la dignidad de la persona humana y un respeto efectivo de sus
derechos y libertades a todo totalitarismo político. La motivación última de todos estos
planteamientos responde a estímulos y valoraciones de sentido y alcance plenamente
humanista y democrático. Es un enfoque con un modo de sentir, hablar, pensar y actuar con una fuerte conexión con el respeto a la persona dentro de unas coordenadas democráticas. Por encima de la filosofía conceptual hay una filosofía de experiencias existenciales, es decir, hay en la captación inteligente del ser humano más que lo puramente conceptual. El cerebro trabaja sobre la realidad, pero hay experiencias existenciales, del sentimiento, del conocimiento en un sentido hondo
Conscientious objection in the health field in Spain: An iusophosophical perspective
El problema de la objeción de conciencia
en el ámbito sanitario no está
cerrado, ni desde el punto de vista de la
fenomenología social ni desde la óptica
jurídica. Hay conflictos entre convicciones
profundas del ser humano y los
deberes jurídicos y, por otra parte, hay
una creciente multiculturalidad de las diferentes
sociedades. En esta perspectiva,
surgen preguntas radicales (de raíz) que
evidentemente son complejas, pero que a
la vez tocan, como agua de rocío, lo más
nuclear de la existencia, tanto de cada individuo
como del conjunto de esa sociedad.
Es fundamental el profundizar en la
necesidad de regular jurídicamente dicha
objeción de conciencia, en beneficio de
un Estado de Derecho Democrático y
Social donde no se vulnere o conculque
ningún aspecto nuclear para la comprensión
y aprehensión del ser humano y su
inabarcable riqueza.The problem of conscientious objection
in the health field is not closed,
neither from the point of view of social
phenomenology nor from the legal
point of view. There are conflicts between
deep convictions of the human
being and legal duties and, on the other
hand, there is a growing multiculturality
of different societies. In this perspective,
radical questions arise (root) that
are obviously complex, but at the same
time touch, as dew water, the most nuclear
of existence, both of each individual
and the whole of that society.
It is fundamental to deepen the need to
legally regulate this objection of conscience,
for the benefit of a Democratic
and Social State of Law where no nuclear
aspect is violated or violated for the
comprehension and apprehension of the
human being and his boundless wealt
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