Theoretical bases of combined nonlinear optical demodulator-amplifer for broadband microwave photonics system

Abstract Our demodulator is based on the use of a strong light pump wave along with a signal modulated light wave. The demodulator is linear in terms of the modulation signal, which makes it possible to obtain a demodulated signal without harmonic distortion. The modulator conversion efciency and signal gain increase with increasing microwave baseband.

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High performing flexible optoelectronic devices using thin films of topological insulator

Scientific Reports ◽

10.1038/s41598-020-80738-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Animesh Pandey ◽

Reena Yadav ◽

Mandeep Kaur ◽

Preetam Singh ◽

Anurag Gupta ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Nonlinear Optical ◽

Near Infrared ◽

Optoelectronic Devices ◽

Nonlinear Optical Properties ◽

Metallic Surface ◽

Strong Light ◽

High Performing ◽

Decay Times

AbstractTopological insulators (TIs) possess exciting nonlinear optical properties due to presence of metallic surface states with the Dirac fermions and are predicted as a promising material for broadspectral phodotection ranging from UV (ultraviolet) to deep IR (infrared) or terahertz range. The recent experimental reports demonstrating nonlinear optical properties are mostly carried out on non-flexible substrates and there is a huge demand for the fabrication of high performing flexible optoelectronic devices using new exotic materials due to their potential applications in wearable devices, communications, sensors, imaging etc. Here first time we integrate the thin films of TIs (Bi2Te3) with the flexible PET (polyethylene terephthalate) substrate and report the strong light absorption properties in these devices. Owing to small band gap material, evolving bulk and gapless surface state conduction, we observe high responsivity and detectivity at NIR (near infrared) wavelengths (39 A/W, 6.1 × 108 Jones for 1064 nm and 58 A/W, 6.1 × 108 Jones for 1550 nm). TIs based flexible devices show that photocurrent is linearly dependent on the incident laser power and applied bias voltage. Devices also show very fast response and decay times. Thus we believe that the superior optoelectronic properties reported here pave the way for making TIs based flexible optoelectronic devices.

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Enhancing the 3rd order nonlinear optical response of integrated micro-ring resonators with graphene oxide 2D films

10.21203/rs.3.rs-617143/v1 ◽

2021 ◽

Author(s):

David Moss

Keyword(s):

Graphene Oxide ◽

Pump Power ◽

Nonlinear Optical ◽

Kerr Nonlinearity ◽

Ring Resonators ◽

Layer By Layer ◽

Large Area ◽

Strong Light ◽

Precise Control ◽

Lift Off

Abstract Layered two-dimensional (2D) graphene oxide (GO) films are integrated with micro-ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics in the form of four-wave mixing (FWM). Both uniformly coated and patterned GO films are integrated on CMOS-compatible doped silica MRRs using a large-area, transfer-free, layer-by-layer GO coating method together with photolithography and lift-off processes, yielding precise control of the film thickness, placement, and coating length. The high Kerr nonlinearity and low loss of the GO films combined with the strong light-matter interaction within the MRRs results in a significant improvement in the FWM efficiency in the hybrid MRRs. Detailed FWM measurements are performed at different pump powers and resonant wavelengths for the uniformly coated MRRs with 1 − 5 layers of GO as well as the patterned devices with 10 − 50 layers of GO. The experimental results show good agreement with theory, achieving up to ~ 7.6-dB enhancement in the FWM conversion efficiency (CE) for an MRR uniformly coated with 1 layer of GO and ~ 10.3-dB for a patterned device with 50 layers of GO. By fitting the measured CE as a function of pump power for devices with different numbers of GO layers, we also extract the dependence of GO’s third-order nonlinearity on layer number and pump power, revealing interesting physical insights about the evolution of the layered GO films from 2D monolayers to quasi bulk-like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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Microwave Photonics: Complementing Light-Wave Technology with High-Speed Electronics

Signals and Communication Technology - SiGe-based Re-engineering of Electronic Warfare Subsystems ◽

10.1007/978-3-319-47403-8_8 ◽

2016 ◽

pp. 235-267

Author(s):

Wynand Lambrechts ◽

Saurabh Sinha

Keyword(s):

High Speed ◽

Light Wave ◽

Microwave Photonics ◽

Wave Technology

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Improvement of nonlinear optical properties of phthalocyanine bearing diethyleneglycole chains: Influence of symmetry lowering vs. heavy atom effect

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424616501042 ◽

2016 ◽

Vol 20 (08n11) ◽

pp. 1296-1305 ◽

Cited By ~ 19

Author(s):

Jonathan Britton ◽

Alexander G. Martynov ◽

David O. Oluwole ◽

Yulia G. Gorbunova ◽

Aslan Yu. Tsivadze ◽

...

Keyword(s):

Optical Materials ◽

Nonlinear Optical ◽

Zinc Complex ◽

Heavy Atom ◽

Strong Light ◽

Electronic Density ◽

H Nmr ◽

Notable Effect ◽

Low Symmetry ◽

Atom Effect

This paper reports the successful synthesis of the low symmetry phthalocyanines: metal-free 2,3-bis[2′-(2′′-hydroxyethoxy)ethoxy]-9,10,16,17,23,24-hexa-[Formula: see text]-butoxyphthalocyanine 1H[Formula: see text] and its zinc complex 1Zn along with their nonlinear optical (NLO) behavior in solution and in thin films. 1H NMR investigations evidenced of higher dissymmetry of electronic density in 1H[Formula: see text] in comparison with 1Zn. This dissymmetry is responsible for unusually higher values of Im[[Formula: see text]]/[Formula: see text], [Formula: see text], and [Formula: see text] for 1H[Formula: see text]in contrast to 1Zn, where the notable effect of heavy-metal enhancement of ISC was expected. Both compounds showed Im[[Formula: see text]]/[Formula: see text] values of the order of 10[Formula: see text] in chloroform which are higher in comparison to the symmetrical octabutoxyphthalocyanine H2[(BuO)8Pc]. NLO properties of 1H[Formula: see text] were improved via its incorporation into polycarbonate polymeric matrix together with CdSe@CdS-TOPO quantum dots. In such composite the value of Im[[Formula: see text]]/[Formula: see text] was almost three times higher in comparison with 1H[Formula: see text] solution in chloroform. The obtained composites are expected to be perspective components of optical materials, capable of protection against strong light irradiation.

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Interaction between atoms in the field of a strong light wave

Physics Letters A ◽

10.1016/0375-9601(90)90017-i ◽

1990 ◽

Vol 147 (1) ◽

pp. 79-80

Author(s):

B.P. Antonyuk

Keyword(s):

Light Wave ◽

Strong Light

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Topological nature of nonlinear optical effects in solids

Science Advances ◽

10.1126/sciadv.1501524 ◽

2016 ◽

Vol 2 (5) ◽

pp. e1501524 ◽

Cited By ~ 135

Author(s):

Takahiro Morimoto ◽

Naoto Nagaosa

Keyword(s):

Electric Field ◽

Nonlinear Optical ◽

Vector Fields ◽

Monochromatic Light ◽

Strong Light ◽

Continuous Irradiation ◽

Nonlinear Properties ◽

Nonlinear Responses ◽

Optical Effects ◽

Nonlinear Optical Effects

There are a variety of nonlinear optical effects including higher harmonic generations, photovoltaic effects, and nonlinear Kerr rotations. They are realized by strong light irradiation to materials that results in nonlinear polarizations in the electric field. These are of great importance in studying the physics of excited states of the system as well as for applications to optical devices and solar cells. Nonlinear properties of materials are usually described by nonlinear susceptibilities, which have complex expressions including many matrix elements and energy denominators. On the other hand, a nonequilibrium steady state under an electric field periodic in time has a concise description in terms of the Floquet bands of electrons dressed by photons. We show theoretically, using the Floquet formalism, that various nonlinear optical effects, such as the shift current in noncentrosymmetric materials, photovoltaic Hall response, and photo-induced change of order parameters under the continuous irradiation of monochromatic light, can be described in a unified fashion by topological quantities involving the Berry connection and Berry curvature. We found that vector fields defined with the Berry connections in the space of momentum and/or parameters govern the nonlinear responses. This topological view offers a route to designing nonlinear optical materials.

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Applications of Oxide Nanomaterials in Nonlinear Optics

MRS Proceedings ◽

10.1557/opl.2012.1229 ◽

2012 ◽

Vol 1454 ◽

pp. 255-259 ◽

Cited By ~ 1

Author(s):

Reji Philip ◽

C.S. Suchand Sandeep ◽

R. Seema ◽

Shiji Krishnan ◽

Panit Chantharasupawong ◽

...

Keyword(s):

Nonlinear Optics ◽

Nonlinear Optical ◽

Inorganic Materials ◽

Light Fields ◽

Strong Light ◽

Optical Effects ◽

Nonlinear Optical Effects ◽

Optoelectronic Applications ◽

Substantial Interest ◽

Organic As

ABSTRACTNonlinear optical effects are revealed when strong light fields interact with matter. It has been shown that nanomaterials exhibit properties which are very different from the bulk, and in many cases, the nonlinear optical (NLO) efficiency of nanomaterials is found to be higher in comparison. Recently there has been substantial interest in developing novel NLO media for various applications. Even though several organic as well as inorganic materials have been studied in this connection, only a limited number of NLO reports exist for oxide nanomaterials. Therefore, in this paper we present results of NLO measurements recently conducted in our laboratory in three different oxide nanosystems. It is found that oxide nanomaterials are generally robust, and exhibit good NLO efficiencies, which make them potential candidates for photonic and optoelectronic applications.

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Nanoscale force sensing of an ultrafast nonlinear optical response

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.2003945117 ◽

2020 ◽

Vol 117 (33) ◽

pp. 19773-19779

Author(s):

Zeno Schumacher ◽

Rasa Rejali ◽

Raphael Pachlatko ◽

Andreas Spielhofer ◽

Philipp Nagler ◽

...

Keyword(s):

Atomic Force Microscopy ◽

Nonlinear Interaction ◽

Nonlinear Optical ◽

Light Emission ◽

Electrostatic Force ◽

Optical Response ◽

Nonlinear Optical Response ◽

Strong Light ◽

Force Microscopy ◽

Atomic Force

The nonlinear optical response of a material is a sensitive probe of electronic and structural dynamics under strong light fields. The induced microscopic polarizations are usually detected via their far-field light emission, thus limiting spatial resolution. Several powerful near-field techniques circumvent this limitation by employing local nanoscale scatterers; however, their signal strength scales unfavorably as the probe volume decreases. Here, we demonstrate that time-resolved atomic force microscopy is capable of temporally and spatially resolving the microscopic, electrostatic forces arising from a nonlinear optical polarization in an insulating dielectric driven by femtosecond optical fields. The measured forces can be qualitatively explained by a second-order nonlinear interaction in the sample. The force resulting from this nonlinear interaction has frequency components below the mechanical resonance frequency of the cantilever and is thus detectable by regular atomic force microscopy methods. The capability to measure a nonlinear polarization through its electrostatic force is a powerful means to revisit nonlinear optical effects at the nanoscale, without the need for emitted photons or electrons from the surface.

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