We report on the nonlinear optical (NLO) transmittance and reflectance of a 20 nm-thick Ag film characterized by time-resolved
white-light continuum pump-probe experiments. The change in complex permittivity Δε(t) is extracted and is
fitted to the Drude model in the frequency domain and a two-temperature model in the time domain. A unified model is
presented that fully describes the dynamic NLO response of a thin Ag film that can be incorporated easily into the
modeling of more complex metal-dielectric multilayer structures designed to take advantage of the NLO response of Ag.
We report on the linear and nonlinear optical properties of Ag/Au multi-metal thin films and Fabry-Perot
resonator cavities. The linear optical properties of these multi-metal layers, having different mass distributions
and Ag/Au ratios with thicknesses around 15 nm, resemble those of electrically continuous metal layers. The
optical losses introduced by interband transitions in the Au layers are reduced to achieve peak transmittances
of 76 % around 550 nm. Using femtosecond-pulsed white-light continuum pump-probe experiments we show
that the nonlinear optical response of such multi-metal layers is comparable to that of neat Au thin films.
Low-finesse Fabry-Perot resonators fabricated with such multi-metal layers, combine the large NLO response
of Au with a transmittance of 60% and a spectral bandwidth that covers the visible spectral range.
We present the design, fabrication and characterization of the optical properties of one-dimensional metal-organic
photonic bandgaps (MO-PBGs) composed of a tetraphenyldiaminobiphenyl-based polymer and ultrathin electrically
continuous Cu layers. The fabricated MO-PBGs achieve a peak transmission of around 44% at 620 nm combined with
very large spectral, around 120 nm FWHM, and angular, more than 120° field-of-view, bandwidths. Using 140 fs pulses
at various wavelengths we have found up to 10 × enhancements in the nonlinear optical (NLO) properties of the MO-PBGs
when compared with the NLO response of ultrathin electrically continuous Cu layers.
We report on the design and fabrication of metal-dielectric photonic band-gap structures (MDPBGs) with high
transmission and broad spectral bandwidth in the visible range. Using the complex refractive index measured by
spectroscopic ellipsometry, we have designed structures with an aperiodic thickness distribution which show a flat
passband transmission (64% ± 1.5%) over more than 150 nm within the visible spectrum. Using e-beam deposition, we
demonstrate the growth of continuous 12 nm Ag layers on Al2O3, and MDPBGs with five periods of Al2O3/Ag/Al2O3
that show more than 49% ± 2.5% transmission and at least 150 nm bandwidths. When compared to dielectric-dielectric
stacks, the use of metallic layers provides excellent out-of-band rejection, in particular beyond the IR edge where the
MDPBG acts collectively as a metallic solid. Such structures could thus be used as hot mirrors with extremely high and
broad out-of-band rejection.
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