Zobrazeno 1 - 10
of 91
pro vyhledávání: '"F. Kalkum"'
Publikováno v:
Applied Physics B. 100:169-172
Using plasmonic resonances of metal films, enhanced transmission of light through sub-wavelength holes has been demonstrated. Here we show that external resonances can be employed as well: the transmission of 1.5-μm wavelength light through 600-nm h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29fc15675cc0084e06ff9c14fbc55223
https://doi.org/10.1007/s00340-010-3989-7
https://doi.org/10.1007/s00340-010-3989-7
Publikováno v:
Applied Physics B. 95:637-645
Holographic phase conjugation is analyzed as a method to create a photo-refractive lens with high numerical aperture. For this purpose a sub-wavelength hole is drilled into a metal surface directly on top of an iron-doped lithium niobate crystal. An
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f73a892c2a2e1afa4206bef3fa451bf
https://doi.org/10.1007/s00340-009-3384-4
https://doi.org/10.1007/s00340-009-3384-4
Publikováno v:
Ferroelectrics. 340:63-67
Two different methods for light-induced domain inversion in lithium niobate crystals are currently under investigation. Illumination with ultra-violet light with photon energies smaller than the band gap (wavelength λ = 334 nm) can reduce the coerci
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db415562cc387049bfa94f60ee20f96b
https://doi.org/10.1080/00150190600888900
https://doi.org/10.1080/00150190600888900
Publikováno v:
Optics Express
Optics Express, Optical Society of America-OSA Publishing, 2007, 15 (5), pp.2613-2621. ⟨10.1364/OE.15.002613⟩
Optics Express, Optical Society of America-OSA Publishing, 2007, 15 (5), pp.2613-2621. ⟨10.1364/OE.15.002613⟩
We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction measured for the surf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fe0fd01d396095f909f6a53a1551a91
https://pubmed.ncbi.nlm.nih.gov/19532500
https://pubmed.ncbi.nlm.nih.gov/19532500
Publikováno v:
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference.
Utilizing the photorefractive effect, space-charge fields are recorded in near-stoichiometric, iron-doped lithium niobate crystals. Together with an external electric field these can lead to tailored inversion of ferroelectric domains.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69a4e021e2ebee934fe6364301fafd0e
https://doi.org/10.1109/cleo.2006.4627679
https://doi.org/10.1109/cleo.2006.4627679
Publikováno v:
Scopus-Elsevier
Elementary holographic gratings are recorded in iron-doped near-stoichiometric lithium niobate crystals in the presence of an external electric field close to the coercive field. The resulting diffraction efficiency ? vanishes upon subsequent homogen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::695a30fda44da56184060b2ff1bd5a39
https://doi.org/10.1364/pemd.2005.101
https://doi.org/10.1364/pemd.2005.101
Autor:
F. Kalkum
Publikováno v:
Journal of the Optical Society of America A. 26:2393
An efficient way to numerically calculate diffraction from large volume holograms is developed using the first-order Born approximation. For this, everything except the propagating part of the Green's function is neglected, and the fact that the grat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a47ad1e01d27583bd95a118bf1e631a5
https://doi.org/10.1364/josaa.26.002393
https://doi.org/10.1364/josaa.26.002393
Publikováno v:
Optics Express. 17:1321
Holograms are recorded with focused beams in an iron-doped lithium niobate crystal. The diffraction efficiency shows a maximum after several seconds of recording, unlike in the case of writing with two homogeneous plane waves in the same crystal. Thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6ae05af2077ba35234aa2c435e66883
https://doi.org/10.1364/oe.17.001321
https://doi.org/10.1364/oe.17.001321
Publikováno v:
Optics Letters. 31:1256
It is shown experimentally and theoretically that a partial domain reversal in ferroelectric lithium niobate crystals containing a previously imprinted photorefractive space-charge grating results in a highly unusual change of the angular Bragg selec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1e4ab753093c1b26e1cb488e9247b17
https://doi.org/10.1364/ol.31.001256
https://doi.org/10.1364/ol.31.001256
Publikováno v:
Applied Physics Letters. 88:051120
Illumination of iron-doped lithium crystals (LiNbO3:Fe) with femtosecond pulses of 1.5μm wavelength results in large refractive index changes Δn in the order of 10−3. The sign of the refractive index changes depends on the polarization of the rec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9c5bd46e7650b84f8fe2e0e37c60192
https://doi.org/10.1063/1.2170434
https://doi.org/10.1063/1.2170434