The infrared spectral region is
important for a number of applications, both military and civilian. In this
talk, we will discuss the development of new optical materials and active
optoelectronic devices that function across this region. In the first part of
this talk, we will discuss novel synthesis techniques for chalcogenide-based
polymers and their properties, which include wide infrared transparency windows
and extremely high refractive indices. To conclude the seminar, we will discuss
refractive non-mechanical beam steering devices. These devices, based around
liquid-crystal clad thin film waveguides, have many advantageous properties
over traditional, mechanical beam steerers, with greatly reduced size, weight,
and power requirements. Here, we will cover the operation principles, design,
fabrication, and steering properties of these devices, which represent a fusion
of materials synthesis, processing, and optical design.
simulation models are often used in healthcare to guide health policies.
Many of the parameters of these models are based on epidemiological data, and
these models often calibrated to match these data in the population. Bayesian
calibration is superior to other forms of calibration because it can produce
the posterior joint distribution of the parameters. However, in practice,
Bayesian calibration is rarely performed, due to computational and conceptual
challenges. In this talk, I will present on overcoming some of these challenges
using recent advances in deep learning algorithms.
Structural colors have shown great promise as an
alternative for the existing colorant-based pigments owing to their noticeable advantages,
such as high brightness, durability and stability, and environmental safety.
They may find potential applications in energy-efficient displays,
high-resolution imaging, special effect coatings, and building-integrated
photovoltaics. The structural colors can be produced by exploiting
optical resonances in various resonators, which can be either 3D, 2D or 1D
structures. For such applications, large area patterning is
highly desirable, which motivated the development high-throughput roll-to-roll
nanoimprint (R2RNIL) technique, as well as other roll-based patterning
processes. They can also be designed with layered structures, which can be
easily made by additive deposition processes. Similar manufacturing processes
can extend to the fabrication of flexible transparent conductors, which could
have wide range of applications in flexible displays and touch screen.
Especially the metal mesh structures can be made using continuous roll
patterning, while ultra-thin metal film based structure by industrial roll
Consumer trust is key to the
success of companies’ social responsibility (SR) communication strategies. In
this context, supply chain transparency has been identified as one of the most
effective ways for companies to improve trust among consumers. However, the
current literature focuses on the effect that disclosing information has on
consumer trust, generally assuming that companies have complete information
(i.e., full supply chain visibility) about the SR practices occurring in their
supply chains (e.g., working conditions). In practice, though, most companies
do not have good visibility into their supply chains. In this study, we design
an incentivized human-subject experiment to examine whether and how visibility
impacts consumers’ trust in companies’ SR communications. Our results show that
by investing to improve visibility into the SR practices in its supply chain, a
company can increase consumer trust in its SR communications. This increased
trust can in turn help the company to increase its sales when a good SR claim
is made. This is particularly true among consumers with prosocial orientations.
This talk is based on joint work
with Tim Kraft and Karen Zheng (MIT).