scholarly journals IP-Dip-Based SPR Structure for Refractive Index Sensing of Liquid Analytes

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1163
Author(s):  
Petra Urbancova ◽  
Dusan Pudis ◽  
Matej Goraus ◽  
Jaroslav Kovac
Keyword(s):  
Refractive Index ◽  
Photon Absorption ◽  
Resonance Structure ◽  
Angle Of Incidence ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Refractive Index Sensing ◽  
External Angle ◽  
Direct Laser ◽  
Index Unit

In this paper, we present a two-dimensional surface plasmon resonance structure for refractive index sensing of liquid analytes. The polymer structure was designed with a period of 500 nm and prepared in a novel IP-Dip polymer by direct laser writing lithography based on a mechanism of two-photon absorption. The sample with a set of prepared IP-Dip structures was coated by 40 nm thin gold layer. The sample was encapsulated into a prototyped chip with inlet and outlet. The sensing properties were investigated by angular measurement using the prepared solutions of isopropyl alcohol in deionized water of different concentrations. Sensitivity of 478–617 nm per refractive index unit was achieved in angular arrangement at external angle of incidence of 20°.

Protein-Based Self-Healing Cu(II)-Metallohydrogels: Efficient Third-Order Nonlinear Optical Materials in Terms of an Intensity-Dependent Refractive Index and Two-Photon Absorption

2020 ◽  
Vol 2 (11) ◽  
pp. 3678-3685
Author(s):  
Santanu Majumdar ◽  
Tara Singha ◽  
Subhendu Dhibar ◽  
Amit Mandal ◽  
Prasanta Kumar Datta ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Materials ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Nonlinear Optical Materials ◽  
Self Healing ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films

2018 ◽  
Vol 8 (10) ◽  
pp. 1810 ◽  
Author(s):  
Rihan Wu ◽  
Jack Collins ◽  
Leigh Canham ◽  
Andrey Kaplan
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Quantum Confinement ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Silicon Thin Films ◽  
Gaussian Decomposition

We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We show an enhancement of the nonlinear refraction and a suppression of TPA in p-Si in comparison to c-Si, and the enhancement gets stronger as the wavelength increases.

Femtosecond-laser direct writing for spatially localized synthesis of PPV

2017 ◽  
Vol 5 (14) ◽  
pp. 3579-3584 ◽  
Author(s):  
Oriana I. Avila ◽  
Juliana M. P. Almeida ◽  
Franciele R. Henrique ◽  
Ruben D. Fonseca ◽  
Gustavo F. B. Almeida ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Photon Absorption ◽  
Direct Laser Writing ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Thermal Reactions ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Direct Laser ◽  
Fs Laser

Conversion of PTHT into PPV is achieved by direct laser writing. Fs-laser pulses induce photo-thermal reactions due to two-photon absorption, resulting in the microscopic control of PPV polymerization. Such methodology is a promising way towards the fabrication of arbitrary polymeric microcircuits.

Enhancement of Intra-tissue Refractive Index Shaping (IRIS) of the cornea by Two-Photon Absorption

2009 ◽  
Author(s):  
Li Ding ◽  
Lana J. Nagy ◽  
Lisen Xu ◽  
Jack Chun-Hung Chang ◽  
Jennifer Swanton ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

Fast and sensitive nonlinear processes: bistability in CdHgTe

1984 ◽  
Vol 313 (1525) ◽  
pp. 277-284 ◽  
Keyword(s):  
Refractive Index ◽  
Optical Bistability ◽  
Continuous Wave ◽  
Photon Absorption ◽  
Cadmium Mercury Telluride ◽  
Large Intensity ◽  
Mercury Telluride ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Fabry Perot

We discuss the origin and characteristics of the very large intensity-dependent changes in the refractive index of the semiconductor cadmium mercury telluride at 10.6 m. With continuous wave (c.w.) radiation and sample temperatures of 77 K nonlinear Fabry-Perot effects can be observed at powers as low as 1 mW. The Auger dominated recombination process and the thermal contributions to the refractive index make observations of optical bistability difficult with c.w. radiation. However, the use of a pulsed CO 2 laser and two-photon absorption of the radiation does lead to the observation of bistability at room temperature. We compare these results with the reported work on InSb.

Tuned intensity-dependent refractive index n2 and two-photon absorption in oxide glasses: Role of non-bridging oxygen bonds in optical nonlinearity

2008 ◽  
Vol 31 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Fouad El-Diasty ◽  
Manal Abdel-Baki ◽  
F.A. Abdel-Wahab
Keyword(s):  
Refractive Index ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Oxide Glasses ◽  
Two Photon Absorption ◽  
Two Photon

Dispersion of nonlinear refractive index in layered WS_2 and WSe_2 semiconductor films induced by two-photon absorption

2016 ◽  
Vol 41 (17) ◽  
pp. 3936 ◽  
Author(s):  
Ningning Dong ◽  
Yuanxin Li ◽  
Saifeng Zhang ◽  
Niall McEvoy ◽  
Xiaoyan Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Photon Absorption ◽  
Semiconductor Films ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Fabrication of silver helix microstructures in a large area by a two-photon absorption DLW method

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Naoto Tsutsumi ◽  
Yusaku Takai ◽  
Kenji Kinashi ◽  
Wataru Sakai
Keyword(s):  
Elevation Angle ◽  
Photon Absorption ◽  
Silver Coating ◽  
Large Area ◽  
Helical Structures ◽  
Free Standing ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Direct Laser ◽  
Plating Method

AbstractLarge-area helix microstructures intended for metamaterials were fabricated using a negative photoresist, SU-8 using a two photon absorption direct laser writing (TPA-DLW). Two types of helix structures were fabricated. One type is those with no neighboring distance. In this case, compact helix structures with radius of 2.5 and 1.0 μm were fabricated. Another type is those with enough neighboring distance. The helix structures with shorter neighboring distance below 6.0 μm were collapsed, whereas those with longer neighboring distance more than 6.5 μm, free-standing helix structures could successfully be built. To stabilize the fabricated free-standing helix microstructures with a 1 μm radius, circular foundations with a radius of 1.3 μm and elevation angle of 10, 12, or 14° were built in advance. The foundation is useful to avoid collapsing the helix microstructures. Due to the useful foundation, over 18,000 helical structures were fabricated in a large area. The fabricated helical structures were coated with silver using an electroless plating method to produce 3D metallic helix structures. Silver coating was measured using a EDX measurement. The obtained helical structures have the potential for metamaterials to control the handedness of a circularly polarized infrared beam.

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