We report on the observation of an inhomogeneous spin-dependent spatial distribution of heavy-hole excitons
generated by a localized inhomogeneous magnetic weak field. An exciton energy splitting is observed between
the spin-up and spin-down states with an energy gap as a function of the magnetic field.
We propose a simple method to create a local magnetic field minima for the magnetic trapping and confining of
excitons. We observe an enhanced spatially resolved photoluminescence of the optically active heavy-hole excitons
concentrated at the confining region in a multiple quantum wells system. We draw the attention to consider the
proposed trapping mechanism as an approach to reach the Bose-Einstein condensate limit of excitons.
We report on the synthesis of new magneto-optical materials with excellent optical and magneto-optical (MO) properties
for visible-range and near-infrared applications. Bi-substituted composite garnet films fabricated with excess bismuth
oxide content using RF co-sputtering and conventional oven-annealing processes are found to possess simultaneously a
record-high MO quality and strong uniaxial magnetic anisotropy. The films demonstrate nearly-square hysteresis loops
with specific Faraday rotations of up to 10.1 deg/μm at 532 nm and up to 2.6 deg/μm at 635 nm, which are significantly
larger than these measured in garnet films of the same composition prepared without extra bismuth oxide content.
Record-high MO figures of merit are demonstrated in our composite garnet materials due to a significant reduction in
the optical absorption coefficients achieved across the visible spectral range, thus making garnet-oxide composites
highly attractive for use in a range of magneto-optical applications.
Magneto-optical imaging is widely used to observe the domain patterns in magnetic materials, visualize defects in
ferromagnetic objects, and measure the spatial distribution of stray magnetic fields. Optimized 1D magneto-photonic
crystals enable a significant increase in the sensitivity of magneto-optical sensors. The properties of such devices based
on the optimized reflection (doubled Faraday rotation) mode and the use of 1D magnetic photonic crystals as sensors are
discussed. Experimental results of the fabrication and characterization of ferrite-garnet layers possessing uniaxial
magnetic anisotropy are shown, and an optimized film structure suitable for magneto-optical imaging is proposed.
We propose a new type of sensors suitable for water quality testing and for monitoring water contamination levels in
domestic, industrial and environmental applications. The proposed sensing scheme uses Fourier transform cavity-enhanced
absorption spectroscopy and novel compact sensing elements based on nanostructured photonic crystal-type
optical coatings enabling the sensitive Fourier-domain processing methodology and maximising the absorption path
length within the measurement system. The measurement scheme is shown to be suitable for the determination of small
changes in the water absorption coefficients at a discrete set of wavelengths in the visible spectral region in response to
small concentrations of pollutants with high sensitivity. The proposed sensors are expected to provide real-time
information on the water contamination levels, as well as potentially the types of substances dissolved.
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