This work is devoted to the first experimental observation of
optical features in spectra of reflectance and third-harmonic
generation of the finite one-dimensional photonic crystals based of
the porous silicon, which caused by "surface" modes of an
electromagnetic field, similarly to surface states of semiconductors
and dielectrics. Semiconductor surface states correspond to
electronic wave which total reflect from potential barrier
crystal-vacuum as well as crystal lattice due to Brag interference.
Therefore the electrons can propagate only along the crystal
surface. Similar effect can observed in electromagnetic spectrum of
photonic crystals. Although ordinary photonic crystals have not
potential barrier crystal-vacuum for photons but they have modified
density of modes at the surface. The surface waves existed at the
interface of two optically different media can be observed using
attenuated total reflectance configuration whereas the change of
density of modes gives a sensitive tool to observe optical
properties in the surface region. For observation optical features
associated to surface states of photonic crystal we have to create
the photonic crystal with few layers - finite photonic crystal. Also
we can observe changes of electromagnetic density of modes by using
third-harmonic generation spectroscopy. Dependence of resonances of
third-harmonic generation on number of layers in the structure was
observed. Increase of Q-factor of photonic crystals lead to wash out
optical features of surface modes in a linear spectrum, whereas the
nonlinear optics remains sensitive to eigenmodes.
The enhancement of the second-harmonic generation (SHG) in all-silicon coupled microcavities (CMC) based on one-dimensional photonic crystals is experimentally studied. CMC are fabricated from alternating layers of electrochemically grown mesoporous silicon and consist of two identical half-wavelength-thick cavity spacers separated by additional porous silicon photonic crystal. The enhancement of the second-harmonic response of CMC in the vicinity of splitted cavity modes is experimentally observed in both angular (wave vector) and frequency domain spectra. The variation of transmission of the intermediate photonic crystal, which controls the interaction between coupled cavity spacers, leads to monotonic dependence of the SHG resonances splitting on the number of pairs of the intermediate Bragg reflector.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.