Free space excitation of coupled Anderson-localized modes in photonic crystal 
waveguides with polarization tailored beam

Mahdavi, Ali; Roth, Paul; Xavier, Jolly; Paraiso, Taofiq K.; Banzer, Peter; Vollmer, Frank

doi:10.1063/1.4986187

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Free space excitation of coupled Anderson-localized modes in photonic crystal waveguides with polarization tailored beam

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Mahdavi, Ali
Vollmer Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons216175

Roth, Paul
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Xavier, Jolly
Vollmer Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Exeter, Living Syst Inst, Dept Phys & Astron;

/persons/resource/persons216347

Paraiso, Taofiq K.
Painter Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Toshiba Res Europe Ltd;

/persons/resource/persons201008

Banzer, Peter
Interference Microscopy and Nanooptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201226

Vollmer, Frank
Vollmer Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Exeter, Living Syst Inst, Dept Phys & Astron;

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Citation

Mahdavi, A., Roth, P., Xavier, J., Paraiso, T. K., Banzer, P., & Vollmer, F. (2017). Free space excitation of coupled Anderson-localized modes in photonic crystal waveguides with polarization tailored beam. APPLIED PHYSICS LETTERS, 110(24): 241101. doi:10.1063/1.4986187.

Cite as: https://hdl.handle.net/21.11116/0000-0000-858A-E

Abstract

We experimentally demonstrate free space excitation of coupled Anderson-localized modes in photonic crystal (PhC) line-defect waveguides (W1) with polarization tailored beams. The corresponding light beam is tightly focused on a pristine W1, and out-of-plane scattering is imaged. By integrating the scattering spectra along the guide, at the W1 modal cut-off, Anderson-localized cavities are observed due to residual W1 fabrication-disorder. Their spectral lines exhibit high quality Q factors up to 2 x 10(5). The incident beam polarization and scattering intensities of the localized modes characterize the efficiency of free-space coupling. The coupling is studied for linearly and radially polarized input beams and for different input coupling locations along the W1 guide. The proposed coupling scheme is particularly attractive for excitation of PhC waveguide modes and Anderson-localized cavities by beam steering and scanning microscopy for sensing applications. Published by AIP Publishing.