Far field photoluminescence imaging of single AlGaN nanowire in the sub‐wavelength scale using confinement of polarized light

Sivadasan, A. K.; Sardar, M.; Dhara, Sandip

doi:10.1002/andp.201600165

Cited by 4 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such effect was most probably due to interference of light scattered on NWs placed at distances comparable to the wavelength. Similar effects were reported for AlGaN NWs in [49], where authors show that PL polarization depends on distance between the NW and assume the existence of long lived photons in the intervening space between the NWs [49]. Also influence of NW geometry on polarization of light emitted from quantum discs embedded in GaN NWs was reported [50].…”

Section: Dependence Of Polarization On Nw Densitysupporting

confidence: 67%

Reflectance and fast polarization dynamics of a GaN/Si nanowire ensemble

Korona

Żytkiewicz

Sobanska

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Optical phenomena in an ensemble of high-quality GaN nanowires (NWs) grown on a Si substrate have been studied by reflectance and time-resolved luminescence. Such NWs form a structure that acts as a virtual layer that specifically reflects and polarizes light and can be characterized by an effective refractive index. In fact we have found that the NW ensembles of high NW density (high filling fraction) behave rather like a layer of effective medium described by the Maxwell Garnett approximation. Moreover, light extinction and strong depolarization are observed that we assign to scattering and interference of light inside the NW ensemble. The wavelength range of high extinction and depolarization correlates well with transverse localization wavelength estimated for such an ensemble of NWs, so we suppose that these effects are due to Anderson localization of light. We also report results of time-resolved measurements of polarization of individual emission centers including free and bound excitons (DX, 3.47 eV), inversion domain boundaries (IDB, 3.45 eV) and stacking faults (SF, 3.42 eV). The emission of the DX and SF lines is polarized perpendicular to GaN c-axis while the 3.45 eV line is polarized along the c-axis which supports a hypothesis that this line is emitted from IDBs. Time-dependent depolarization of luminescence is observed during the first 0.1 ns after excitation and is interpreted as the result of interaction of the emission centers with hot particles existing for a short time after excitation.

show abstract

Section: Dependence Of Polarization On Nw Densitysupporting

confidence: 67%

Reflectance and fast polarization dynamics of a GaN/Si nanowire ensemble

Korona

Żytkiewicz

Sobanska

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…In addition, we are aware that photoluminescence imaging 54 , 55 and photothermal imaging 50 have also revealed polarisation dependence signal from nanowire/nanorod on far-field microscopes. We use the combination of far-filed microscopy with microsphere for the purpose to achieve super-resolution at nanosphere and nanorod dimer’s gap region.…”

Section: Discussionmentioning

confidence: 99%

Microsphere Assisted Super-resolution Optical Imaging of Plasmonic Interaction between Gold Nanoparticles

Hou¹,

Xie²,

He³

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Conventional far-field microscopy cannot directly resolve the sub-diffraction spatial distribution of localized surface plasmons in metal nanostructures. Using BaTiO3 microspheres as far-field superlenses by collecting the near-field signal, we can map the origin of enhanced two-photon photoluminescence signal from the gap region of gold nanosphere dimers and gold nanorod dimers beyond the diffraction limit, on a conventional far-field microscope. As the angle θ between dimer’s structural axis and laser polarisation changes, photoluminescence intensity varies with a cos4θ function, which agrees quantitatively with numerical simulations. An optical resolution of about λ/7 (λ: two-photon luminescence central wavelength) is demonstrated at dimer’s gap region.

show abstract

“…The improved light-matter interaction can be achieved by trapping the photons in the contrast of different dielectric materials. Recent reports related to the proximity induced light-matter interaction shed a glimpse of light to the Raman spectroscopic studies [7], and photoluminescence (PL) imaging of single semiconductor nanostructure (~100 nm) in the sub-diffraction limit [8]. In order to improve the optical gain, it is customary to design hybrid systems with the combination of optical confinement by means of dielectric contrast and plasmonics [9].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopically forbidden infra-red emission in Au-vertical graphene hybrid nanostructures

et al. 2017

Self Cite

View full text Add to dashboard Cite

Implementation of Au nanoparticles (NPs) is a subject for frontier plasmonic research due to its fascinating optical properties. Herein, the present study deals with plasmonic assisted emission properties of Au NPs-vertical graphene (VG) hybrid nanostructures. The influence of effective polarizability of Au NPs on the surface enhanced Raman scattering and luminescence properties is investigated. In addition, a remarkable infra-red emission in the hybrid nanostructures is observed and interpreted on the basis of intra-band transitions in Au NPs. The flake-like nanoporous VG structure is invoked for the generation of additional confined photons to impart additional momentum and a gradient of confined excitation energy towards initiating the intra-band transitions of Au NPs. Integrating Au plasmonic materials in three-dimensional VG nanostructures enhances the light-matter interactions. The present study provides a new adaptable plasmonic assisted pathway for optoelectronic and sensing applications.

show abstract

Far field photoluminescence imaging of single AlGaN nanowire in the sub‐wavelength scale using confinement of polarized light

Cited by 4 publications

References 49 publications

Reflectance and fast polarization dynamics of a GaN/Si nanowire ensemble

Reflectance and fast polarization dynamics of a GaN/Si nanowire ensemble

Microsphere Assisted Super-resolution Optical Imaging of Plasmonic Interaction between Gold Nanoparticles

Spectroscopically forbidden infra-red emission in Au-vertical graphene hybrid nanostructures

Contact Info

Product

Resources

About