LIGHT CAPTURING WITHIN THE DEFECT LOCATED IN LINEAR ONE-DIMENSIONAL PHOTONIC LATTICE

Numerically investigated the light beam propagation through one-dimensional photonic lattice possessing one linear defect. It is shown how capturing of light depends on lattice characteristics as well as the width and wavelength of input light beam. Results may be useful for all-optical control of transmission of waves in interferometry.

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All-optical control of the time delay in a one-dimensional photonic bandgap formed by double-quantum-wells

Optics Communications ◽

10.1016/j.optcom.2007.10.111 ◽

2008 ◽

Vol 281 (4) ◽

pp. 644-654 ◽

Cited By ~ 6

Author(s):

M.A. Antón ◽

F. Carreño ◽

Oscar G. Calderón ◽

Sonia Melle

Keyword(s):

Time Delay ◽

Quantum Wells ◽

Photonic Bandgap ◽

Optical Control ◽

Double Quantum ◽

One Dimensional ◽

All Optical

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Manipulation of light beam propagation in one-dimensional photonic lattices with linear refractive index profile

Optics Communications ◽

10.1016/j.optcom.2014.09.035 ◽

2015 ◽

Vol 335 ◽

pp. 194-198 ◽

Cited By ~ 1

Author(s):

Ana Radosavljević ◽

Goran Gligorić ◽

Aleksandra Maluckov ◽

Milutin Stepić

Keyword(s):

Refractive Index ◽

Light Beam ◽

Beam Propagation ◽

Refractive Index Profile ◽

Index Profile ◽

One Dimensional ◽

Photonic Lattices ◽

Linear Refractive Index

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Effect of a geometric defect on light propagation through a composite linear photonic lattice

Facta universitatis - series Physics Chemistry and Technology ◽

10.2298/fupct1503163k ◽

2015 ◽

Vol 13 (3) ◽

pp. 163-169

Author(s):

S. Kuzmanovic ◽

A. Mancic ◽

M. Stojanovic-Krasic

Keyword(s):

Light Beam ◽

Light Propagation ◽

Beam Propagation ◽

Input Beam ◽

Beam Position ◽

One Dimensional ◽

Optical Media ◽

Dynamical Regimes ◽

Light Beams ◽

Geometric Defect

In this paper we investigated numerically light beam propagation through a one-dimensional composite photonic lattice composed of two structurally different lattices, with a geometric defect emerging at the interface between the two of them. Depending on the initial light beam position with respect to the geometric defect and the transverse tilt of the input beam, different dynamical regimes have been identified. Presented results may be useful for different applications, such as blocking, filtering and transporting light beams through optical media.

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Ultrafast Switching Dynamics

10.1093/oso/9780198788669.003.0011 ◽

2017 ◽

Author(s):

Olle Eriksson ◽

Anders Bergman ◽

Lars Bergqvist ◽

Johan Hellsvik

Keyword(s):

Lower Energy ◽

Research Field ◽

Optical Control ◽

Magnetic Memory ◽

Magnetic Media ◽

Switching Dynamics ◽

All Optical ◽

Ultrafast Switching ◽

Stored Information ◽

Intense Research

The time-integrated amount of data and stored information, is doubled roughly every eighteen months, and since the majority of the worlds information is stored in magnetic media, the possibility to write and retrieve information in a magnetic material at ever greater speed and with lower energy consumption, has obvious benefits for our society. Hence the seemingly simple switching of a magnetic unit, a bit, is a crucial process which defines how efficiently information can be stored and retrieved from a magnetic memory. Of particular interest here are the concepts of ultrafast magnetism and all-optical control of magnetism which have in recent decades become the basis for an intense research field. The motivation is natural; the mechanisms behind these phenomena are far from trivial and the technological implications are huge.

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Optofluidic Platform Based on Liquid Crystals in X-Cut Lithium Niobate: Thresholdless All-Optical Response

Crystals ◽

10.3390/cryst11080908 ◽

2021 ◽

Vol 11 (8) ◽

pp. 908

Author(s):

Fabrizio Ciciulla ◽

Annamaria Zaltron ◽

Riccardo Zamboni ◽

Cinzia Sada ◽

Francesco Simoni ◽

...

Keyword(s):

Liquid Crystal ◽

Liquid Crystals ◽

Light Intensity ◽

Lithium Niobate ◽

Photovoltaic Effect ◽

Optical Control ◽

Crystal Layer ◽

Liquid Crystal Layer ◽

Threshold Behaviour ◽

All Optical

In this study, we present a new configuration of the recently reported optofluidic platform exploiting liquid crystals reorientation in lithium niobate channels. In order to avoid the threshold behaviour observed in the optical control of the device, we propose microchannels realized in a x-cut crystal closed by a z-cut crystal on the top. In this way, the light-induced photovoltaic field is not uniform inside the liquid crystal layer and therefore the conditions for a thresholdless reorientation are realized. We performed simulations of the photovoltaic effect based on the well assessed model for Lithium Niobate, showing that not uniform orientation and value of the field should be expected inside the microchannel. In agreement with the re-orientational properties of nematic liquid crystals, experimental data confirm the expected thresholdless behaviour. The observed liquid crystal response exhibits two different regimes and the response time shows an unusual dependence on light intensity, both features indicating the presence of additional photo-induced fields appearing above a light intensity of 107 W/m2.

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Functional THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces

Nature Communications ◽

10.1038/s41467-020-20283-0 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Cormac McDonnell ◽

Junhong Deng ◽

Symeon Sideris ◽

Tal Ellenbogen ◽

Guixin Li

Keyword(s):

Amino Acids ◽

Linear Polarization ◽

Berry Phase ◽

Science And Technology ◽

Optical Control ◽

Biomedical Science ◽

Spin States ◽

Single Cycle ◽

All Optical ◽

Thz Waves

AbstractRecent advances in the science and technology of THz waves show promise for a wide variety of important applications in material inspection, imaging, and biomedical science amongst others. However, this promise is impeded by the lack of sufficiently functional THz emitters. Here, we introduce broadband THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces, which exhibit unique optical functionalities. Using these new emitters, we experimentally demonstrate tunable linear polarization of broadband single cycle THz pulses, the splitting of spin states and THz frequencies in the spatial domain, and the generation of few-cycle pulses with temporal polarization dispersion. Finally, we apply the ability of spin control of THz waves to demonstrate circular dichroism spectroscopy of amino acids. Altogether, we achieve nanoscale and all-optical control over the phase and polarization states of the emitted THz waves.

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