Fully parallel modified signed-digit arithmetic operations are realized based on redundant bit representation of the digits proposed. A new truth-table minimizing technique is presented based on redundant-bitrepresentation coding. It is shown that only 34 minterms are enough for implementing one-step modified signed-digit addition and subtraction with this new representation. Two optical implementation schemes, correlation and matrix multiplication, are described. Experimental demonstrations of the correlation architecture are presented. Both architectures use fixed minterm masks for arbitrary-length operands, taking full advantage of the parallelism of the modified signed-digit number system and optics.
We studied the long-term optical performance of an adaptive optics scanning laser ophthalmoscope that uses a liquid crystal on silicon spatial light modulator to correct ocular aberrations. The system achieved good compensation of aberrations while acquiring images of fine retinal structures, excepting during sudden eye movements. The residual wavefront aberrations collected over several minutes in several situations were statistically analyzed. The mean values of the root-mean-square residual wavefront errors were 23-30 nm, and for around 91-94% of the effective time the errors were below the Marechal criterion for diffraction limited imaging. The ability to axially shift the imaging plane to different retinal depths was also demonstrated.
A strong
light–matter interaction is highly desirable from
the viewpoint of both fundamental research and practical application.
Here, we propose a dielectric–metal hybrid nanocavity composed
of a silicon (Si) nanoparticle and a thin gold (Au) film and investigate
numerically and experimentally the coupling between the plasmons supported
by the nanocavity and the excitons in an embedded tungsten disulfide
(WS2) monolayer. When a Si/WS2/Au nanocavity
is excited by the surface plasmon polariton generated on the surface
of the Au film, greatly enhanced plasmon–exciton coupling originating
from the hybridization of the surface plasmon polariton, the mirror-image-induced
magnetic dipole, and the exciton modes is clearly revealed in the
angle- or size-resolved scattering spectra. A Rabi splitting as large
as ∼240 meV is extracted by fitting the experimental data with
a coupled harmonic oscillator model containing three oscillators.
Our findings open new horizons for constructing nanoscale photonic
devices by exploiting dielectric–metal hybrid nanocavities.
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