Two-photon absorption coefficient determination using the differential F-scan technique

Rueda, Édgar; Serna, Juan; Hamad, Abdullatif; García, Hernando

doi:10.1016/j.optlastec.2019.105584

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…We studied nonlinear optical properties of nanopyramidal systems, namely pure Ag, pure Fe, and Fe–Ag (with 30 and 90% overlap) at 1550 nm, which exhibited surface plasmon-induced resonant absorption at 750 nm (except for pure Fe nanopyramidal system). The third-order optical nonlinearities were studied by f -scan methods, particularly transmission f -scan and reflection f -scan, which are modifications of the conventional z -scan methods. − The detail about f -scan measurements is presented in the Experimental Section. These methods allow us to measure the third-order nonlinear index of refraction ( n 2 ) in reflection and the nonlinear absorption or two-photon absorption coefficient (β) in transmission modes.…”

Section: Resultsmentioning

confidence: 99%

Bimetallic Fe–Ag Nanopyramid Arrays for Optical Communication Applications

Koirala

García

Sandireddy

et al. 2021

ACS Appl. Nano Mater.

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There is a pressing need to discover optical and magneto-optical materials with better performance and lower cost that operate at telecommunication wavelengths. Here, we report the discovery of giant negative nonlinear refraction and nonlinear (photoinduced) Faraday rotation at 1550 nm using an array of bimetallic Fe−Ag nanopyramids. This system exhibited a very large third-order nonlinear refractive index (n 2 = −2.32 cm 2 /GW) and nonlinear figure of merit (F = 2.3). The same system also exhibited an extraordinarily large magneto-optical susceptibility (χ i 4 = 6.5 × 10 −12 esu) and nonlinear Faraday rotation up to 2.5 radian/μm at a magnetic field of 0.5 T. The nonlinear response was dependent on the degree of overlap of the Fe nanopyramid on the Ag nanopyramid, which influences the strength of plasmon-induced dipoles on the Ag nanopyramid. This nanoscale system opens up a rich set of possibilities in utilizing magnetoplasmonic materials to miniaturize future multifunctional devices such as frequency converters and Faraday rotators at telecommunication wavelengths.

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Section: Resultsmentioning

confidence: 99%

Bimetallic Fe–Ag Nanopyramid Arrays for Optical Communication Applications

Koirala

García

Sandireddy

et al. 2021

ACS Appl. Nano Mater.

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“…The measurements are also more tedious than in the case of TPEF. A modification of the technique called f-scan uses an electrically tuned variable focal length lens, which has the advantage of fast measurements and does not require the movement of the sample [22,[57][58][59].…”

Section: Evaluation Of Parameters Relevant For the Use Of Photosensitizersmentioning

confidence: 99%

Prospects for More Efficient Multi-Photon Absorption Photosensitizers Exhibiting Both Reactive Oxygen Species Generation and Luminescence

et al. 2021

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The use of two-photon absorption (TPA) for such applications as microscopy, imaging, and photodynamic therapy (PDT) offers several advantages over the usual one-photon excitation. This creates a need for photosensitizers that exhibit both strong two-photon absorption and the highly efficient generation of reactive oxygen species (ROS), as well as, ideally, bright luminescence. This review focuses on different strategies utilized to improve the TPA properties of various multi-photon absorbing species that have the required photophysical properties. Along with well-known families of photosensitizers, including porphyrins, we also describe other promising organic and organometallic structures and more complex systems involving organic and inorganic nanoparticles. We concentrate on the published studies that provide two-photon absorption cross-section values and the singlet oxygen (or other ROS) and luminescence quantum yields, which are crucial for potential use within PDT and diagnostics. We hope that this review will aid in the design and modification of novel TPA photosensitizers, which can help in exploiting the features of nonlinear absorption processes.

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“…pure Ag, pure Fe and Fe-Ag (with 30% and 90% overlap) at 1550 nm whose surface plasmons induced resonant absorption was at 750 nm (except for pure Fe pyramidal system). The third order optical nonlinearities were studied by f-scan methods, particularly transmission f-scan and reflection f-scan, which are modifications of the conventional z-scan method [36][37][38]. These methods allow us to measure the nonlinear index of refraction (n 2 ) in reflection and the nonlinear absorption or two photon absorption coefficient (β ) in transmission modes.…”

Section: Nonlinear Optical Propertiesmentioning

confidence: 99%

Bimetallic Fe-Ag arrays with extraordinary nonlinear refraction and nonlinear Faraday rotation at telecommunication wavelength (1550 nm)

Koirala

García

Sandireddy

et al. 2020

Preprint

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There is a pressing need to discover magneto-optical materials and devices with better performance and lower cost that operate at telecommunication wavelengths. Here we report the discovery of giant negative nonlinear refraction and nonlinear Faraday rotation at 1550 nm using an array of bimetallic Fe-Ag nanopyramids. This system exhibited a very large third order nonlinear refractive index (n2 = -2.32 cm2/GW) and nonlinear figure of merit (F = 2.3). The same system also exhibited an extraordinarily large magneto-optical susceptibility (χi4 = 6.5 × 10-12 esu) and photoinduced nonlinear Faraday rotation up to 2.5 radian/μm at a magnetic field of 0.5 T. The nonlinear response was dependent on the degree of overlap of the Fe nanopyramid on the Ag nanopyramid which influences the strength of plasmon induced dipoles on the Ag nanopyramid. This nanoscale system opens up a rich new set of possibilities in utilizing magneto-plasmonic materials to miniaturize future multifunctional devices at telecommunication wavelengths.

show abstract

Two-photon absorption coefficient determination using the differential F-scan technique

Cited by 14 publications

References 16 publications

Bimetallic Fe–Ag Nanopyramid Arrays for Optical Communication Applications

Bimetallic Fe–Ag Nanopyramid Arrays for Optical Communication Applications

Prospects for More Efficient Multi-Photon Absorption Photosensitizers Exhibiting Both Reactive Oxygen Species Generation and Luminescence

Bimetallic Fe-Ag arrays with extraordinary nonlinear refraction and nonlinear Faraday rotation at telecommunication wavelength (1550 nm)

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