Anomalous coherent backscattering of light from opal photonic crystals.
نویسندگان
چکیده
We studied coherent backscattering (CBS) of light from opal photonic crystals with incomplete band gaps. We observed a dramatic broadening of the CBS cone for incident angles close to the Bragg condition in the crystals. We modify the conventional CBS theory to incorporate Bragg attenuation resulting from the photonic band structure. By fitting the CBS data with the modified theory, we extract both the disorder-induced light mean-free path and the Bragg attenuation length of the inherent opal photonic crystal.
منابع مشابه
Quantitative analysis of directional spontaneous emission spectra from light sources in photonic crystals
We have performed angle-resolved measurements of spontaneous-emission spectra from laser dyes and quantum dots in opal and inverse opal photonic crystals. Pronounced directional dependencies of the emission spectra are observed: angular ranges of strongly reduced emission adjoin with angular ranges of enhanced emission. It appears that emission from embedded light sources is affected both by th...
متن کاملOptical properties of real photonic crystals: anomalous diffuse transmission
Unavoidable structural disorder in photonic crystals causes multiple scattering of light, resulting in extinction of coherent beams and generation of diffuse light. We demonstrate experimentally that the diffusely transmitted intensity is distributed over exit angles in a strikingly non-Lambertian manner, depending strongly on frequency. The angular redistribution of diffuse light reveals both ...
متن کاملSuperprism effect in opal-based photonic crystals
This paper investigates the superprism effect in opal-based three-dimensional photonic crystals which consist of an face-centered cubic ~fcc! array of close-packed dielectric spheres embedded in a host. The light propagation angle inside the opals is determined by the group velocity vector of the bulk eigenmodes having the strongest coupling with the incident light at the boundary of the opal. ...
متن کاملExperimental evidence of polarization dependence in the optical response of opal-based photonic crystals
We report angle resolved reflectivity measurements showing the polarization dependence of the pseudogap in artificial opals. This kind of photonic crystals consist of silica spheres ordered in a face-centered-cubic lattice. The analyzed gap originates from the ~111! family of planes. It is shown that the width of the Bragg peak observed in the reflectance spectra follows the bands determining t...
متن کاملLight generation at the anomalous dispersion high energy range of a nonlinear opal film.
We study experimentally and theoretically light propagation and generation at the high energy range of a close-packed fcc photonic crystal of polystyrene spheres coated with a nonlinear material. We observe an enhancement of the second harmonic generation of light that may be explained on the basis of amplification effects arising from propagation at anomalous group velocities. Theoretical calc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 86 21 شماره
صفحات -
تاریخ انتشار 2001