Observation of Bragg reflection in photonic crystals synthesized from air spheres in a titania matrix

Richel, A.; Johnson, Nigel P.; McComb, David W.

doi:10.1063/1.126175

Cited by 192 publications

(101 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first peak shifts to shorter wavelength, and peak intensity decreases with increasing incident angles. The peak wavelength to the incident angle is expressed by a modified Bragg's law taking into account Snell's law of refraction (23) (24) . , where D is the diameter of silica spheres.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Reflectivity of Photonic Crystals Self-assembled with Silica Spheres

Kihara

Miyazaki

Tsukamoto

et al. 2006

JTST

View full text Add to dashboard Cite

We investigate the spectral reflectivity of photonic crystals assembled with silica spheres. The propagation of electromagnetic wave can be controlled by periodic structures known as photonic crystals. Therefore photonic crystals are anticipated for advanced control of thermal radiation beyond solid state properties. The close-packed photonic crystals well-defined thickness are rapidly made on a Si wafer by using self-assembly of colloidal silica spheres. We measure spectral reflectivities of the samples with an FT-IR (Fourier Transform -Infrared Spectroscopy). The spectral reflectivity is enhanced at specific wavelength designed with numerical analysis. The peak of spectral reflectivity shifts to shorter wavelength with increasing incident angle. The angular dependency of the spectral reflectivity can be roughly calculated by the modified Bragg's equation taking into account Snell's law of refraction. We show that the reflectivity in infrared range is well enhanced by using large photonic crystals assembled with silica micro-spheres.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The prepared large photonic crystals are called colloidal photonic crystals. The optical properties in visible range of the colloidal photonic crystals have been already investigated numerically and experimentally (15)- (17) .…”

Section: Introductionmentioning

confidence: 99%

Reflectivity of Photonic Crystals Self-assembled with Silica Spheres

Kihara

Miyazaki

Tsukamoto

et al. 2006

JTST

View full text Add to dashboard Cite

show abstract

“…8͒, as seen in other inverse-opal photonic crystals. 11,25 This first-order Bragg diffraction contains the information about the interplanar spacing. If we assume that the system can be represented by a stack of uniform dielectric slabs with a refractive index of n eff and thickness d 111 then a simple analysis can be performed.…”

Section: Bragg Diffraction From Photonic Crystalmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12][13] When these structures are probed for optical properties, various assumptions are made regarding the structural details which are based on the synthesis technique. In certain experimental approaches, drastic structural changes can occur during the intermediate processing steps, which may involve etching or heat treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Index contrast is sought using a wide choice of background materials: polymers, metals, ceramic precursors, oxide nanoparticles, and semiconductors. Controlled crystal-growth techniques have been developed by various groups [4][5][6][7][8][9][11][12][13] to deal with the problem of disorder and other crystal defects. Depending on the approach the intermediate processing steps may introduce changes in the final structure obtained.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural characterization of thin film photonic crystals

et al. 2001

View full text Add to dashboard Cite

We quantitatively analyze the structure of thin film inverse-opal photonic crystals composed of ordered arrays of air pores in a background of titania. Ordering of the sphere template and introduction of the titania background were performed simultaneously in the thin film photonic crystals. Nondestructive optical measurements of backfilling with high refractive index liquids, angle-resolved reflectivity, and optical spectroscopy were combined with band-structure calculations. The analysis reveals a thin film photonic crystal structure with a very high filling fraction (92-94 %) of air and a substantial compression along the c axis (∼22-25% We quantitatively analyze the structure of thin film inverse-opal photonic crystals composed of ordered arrays of air pores in a background of titania. Ordering of the sphere template and introduction of the titania background were performed simultaneously in the thin film photonic crystals. Nondestructive optical measurements of backfilling with high refractive index liquids, angle-resolved reflectivity, and optical spectroscopy were combined with band-structure calculations. The analysis reveals a thin film photonic crystal structure with a very high filling fraction ͑92-94 %͒ of air and a substantial compression along the c axis (ϳ22-25 %).

show abstract

Tuning Solvent-Dependent Color Changes of Three-Dimensionally Ordered Macroporous (3DOM) Materials Through Compositional and Geometric Modifications

et al. 2001

View full text Add to dashboard Cite

Striking color changes in the visible spectrumare produced when the voids of three‐dimensionally ordered macroporous (3DOM) silica, alumina, and zirconia (“inverse opals”) are filled with solvents, it is reported here (see Figure). The wavelength of these colors is linearly related to the refractive index of the fluid filling the pores and can be tuned by modifying the refractive index of the wall material as well as the size and spacing of the pores.

show abstract

Observation of Bragg reflection in photonic crystals synthesized from air spheres in a titania matrix

Cited by 192 publications

References 10 publications

Reflectivity of Photonic Crystals Self-assembled with Silica Spheres

Reflectivity of Photonic Crystals Self-assembled with Silica Spheres

Structural characterization of thin film photonic crystals

Tuning Solvent-Dependent Color Changes of Three-Dimensionally Ordered Macroporous (3DOM) Materials Through Compositional and Geometric Modifications

Contact Info

Product

Resources

About