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Below-bandgap excitation of bulk semiconductors by twisted light
(Europhysics Letters, 2010-07)
I theoretically investigate the excitation of bulk semiconductors by twisted light below the energy bandgap. To this end, I modify a well-known model of light-semiconductor interaction to account for the conservation of ...
Theory of the optical absorption of light carrying orbital angular momentum by semiconductors
(Europhysics Letters, 2009-02)
We develop a free-carrier theory of the optical absorption of light carrying orbital angular momentum (twisted light) by bulk semiconductors. We obtain the optical transition matrix elements for Bessel-mode twisted light ...
Electronic transitions in quantum dots and rings induced by inhomogeneous off-centered light beams
(IOP Publishing, 2010-11)
We theoretically investigate the effect of inhomogeneous light beams with (twisted light) and without (plane-wave light) orbital angular momentum on semiconductor-based nanostructures, when the symmetry axes of the beam ...
Twisted-Light-Ion Interaction: The Role of Longitudinal Fields
(American Physical Society, 2017-12)
The propagation of light beams is well described using the paraxial approximation, where field components along the propagation direction are usually neglected. For strongly inhomogeneous or shaped light fields, however, ...
Chiral power change upon photoisomerization in twisted nematic liquid crystals
(Pergamon-Elsevier Science Ltd, 2015-05-05)
In this work, we use the photoisomerization of azobenzenes, a phenanthrospirooxazine, and a fulgide in a twisted nematic liquid crystalline phase to change the chiral twisting power of the system. The changes are probed ...
Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling
(2016)
Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent ...
Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling
(2016)
Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent ...
Spontaneous Light-Induced Turing Patterns In A Dye-Doped Twisted Nematic Layer
(2018)
Optical pattern formation is usually due either to the combination of diffraction and nonlinearity in a Kerr medium or to the temporal modulation of light in a photosensitive chemical reaction. Here, we show a different ...
Longitudinal Patterning Of Twisted Light Beams
(IEEENew York, 2016)