ABSORPTION, EMISSION AND NONLINEAR SPECTROSCOPIC CHARACTERIZATION OF REACTIVE DYE

2006 ◽  
Vol 15 (04) ◽  
pp. 481-490
Author(s):  
SHENG-LI GUO ◽  
ZHUN GUO ◽  
T. SUSDORF ◽  
TIAN-DE CAO
Keyword(s):  
Ground State ◽  
Nonlinear Optical ◽  
Spectroscopic Characterization ◽  
Reactive Dye ◽  
Mode Locking ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Saturable Absorption ◽  
Potential Candidate ◽  
Reactive Orange

An optical spectroscopic characterization is carried out on a reactive dye (reactive orange 1). This dye is widely applied in textile coloration. It is a potential candidate for photonics applications. Its absorption cross-section spectra are measured. A fluorescence spectroscopic characterization is undertaken by measuring the fluorescence quantum distributions and fluorescence quantum yields. The saturable absorption is studied by nonlinear transmission measurements with intense picosecond laser pulses (second harmonic pulses of a mode-locked Nd :glass laser). The nonlinear optical absorption and refraction coefficients are measured by using the top-hat Z-scan technique at a wavelength of 532 nm with 35 ps duration pulses. Reactive orange 1 has the two-photon absorption coefficient of 1.20 cm/GW and the nonlinear refraction coefficient of -7.33 × 10-6 cm2/GW, respectively. In reactive orange 1, there occurs fast ground-state recovery by internal conversion likely via conical intersections. Low excited-state absorption and fast ground-state absorption recovery make it an ideal candidate for passive mode-locking of picosecond and femtosecond lasers as well as for fast nonlinear optical gating.

scholarly journals Giant Nonlinear Optical Activity in Two-Dimensional Palladium Diselenide

2020 ◽  
Author(s):  
Juan YU ◽  
Xiaofei KUANG ◽  
Junzi Li ◽  
Jiahong Zhong ◽  
Cheng Zeng ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Near Infrared ◽  
Second Harmonic ◽  
2D Materials ◽  
Photon Absorption ◽  
Excitation Wavelength ◽  
Saturable Absorption ◽  
Metal Chalcogenides ◽  
Potential Candidate ◽  
Two Dimensional

Abstract Nonlinear optical (NLO) effects in layered atomically thin two-dimensional (2D) materials provide a promising prospect for multifarious optoelectronic applications. The NLO characteristics of transition metal chalcogenides (TMDCs) are attracting growing attention and have been extensively explored recently. However, these materials possess sizable bandgaps ranging from visible to ultraviolet regions, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the NLO processes in palladium diselenide (PdSe2) flakes that have a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation (SHG) feature, embodied in the strong (negligible) SHG signals in even (odd) layers, in contrast with that of other TMDCs. Furthermore, the two-photon absorption (TPA) coefficients (β ~4.5×105, 2.83×105, 1.7×105, and 1.85×104 cm/GW) of 1-3 L and bulk PdSe2 are larger by two and three orders of magnitude, compared with that of the conventional 2D materials. Significantly, at the excitation wavelength of 600 nm, a robust saturable absorption with giant modulation depths (αs ~47%, 30%, and 41%) was observed in 1-3 L PdSe2, which has yet been obtained in other 2D materials. Such unique NLO characteristics enable PdSe2 to be a potential candidate for technological innovations in nonlinear optoelectronic devices.

2D organic-inorganic hybrid perovskite materials for nonlinear optics

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1787-1810 ◽  
Author(s):  
Xiao Han ◽  
Yongshen Zheng ◽  
Siqian Chai ◽  
Songhua Chen ◽  
Jialiang Xu
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Low Cost ◽  
Laser Pulses ◽  
Structural Features ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Research Attention ◽  
Inorganic Hybrid ◽  
Quantum Well Structures

AbstractTwo-dimensional (2D) organic-inorganic hybrid perovskites feature characteristics of inherent quantum-well structures and intriguing optoelectronic properties, and have therefore attracted enormous research attention for their optical applications in light emitting, sensing, modulation, and telecommunication devices. The low-cost and solution-processed fabrications as well as alternative organic spacer cations endue 2D hybrid perovskites with higher tunability in optical and photonic applications. In particular, they demonstrate distinguished nonlinear optical characters such as second-harmonic generation (SHG), two-photon absorption (2PA), and saturable absorption (SA) under the excitation of laser pulses. Here, we discuss the construction of the various sorts of 2D hybrid perovskites with different structural features. We have also highlighted some representative properties and applications of these 2D hybrid perovskites in both linear and nonlinear optical regimes.

Nonlinear optical interactions of Co: ZnO nanoparticles in continuous and pulsed mode of operations

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80756-80765 ◽  
Author(s):  
Rajeswari Ponnusamy ◽  
Dhanuskodi Sivasubramanian ◽  
P. Sreekanth ◽  
Vinitha Gandhiraj ◽  
Reji Philip ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Zno Nanoparticles ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Thermal Lensing ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Pulsed Mode ◽  
Limiting Behaviour

Thermal lensing and two photon absorption with saturable absorption based optical limiting behaviour in Co: ZnO nanoparticles under CW and pulsed Nd: YAG laser irradiation.

Spectroscopy and Nonlinear Absorption of α, ω-dithienyi Polyenes

1997 ◽  
Vol 479 ◽  
Author(s):  
L. V. Natarajan ◽  
Laura A. Sowards ◽  
C. W. Spangler ◽  
N. Tang ◽  
P. A. Fleitz ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Steady State Fluorescence ◽  
Nonlinear Optical Absorption ◽  
Substituted Polyenes

AbstractThe photophysics and nonlinear absorption behaviour of a series of α, ω-dithienyl polyenes were studied in chloroform and n-octane solutions. Steady state fluorescence, fluorescence lifetime and quantum yield measurements were made. The fluorescence quantum yields were significantly lower than those of the corresponding ax,o-diphenyl polyenes. Among the dithienyl polyenes, 3,3′-substituted polyenes exhibited stronger fluorescence than those of the 2,2′-substituted. Nonlinear optical absorption experiments showed evidence of two photon absorption.

Ultrafast third order nonlinear optical properties of water soluble zinc-octacarboxy-phthalocyanine

2012 ◽  
Vol 16 (09) ◽  
pp. 1015-1023 ◽  
Author(s):  
M. Bala Murali Krishna ◽  
L. Giribabu ◽  
D. Narayana Rao
Keyword(s):  
Optical Switching ◽  
Nonlinear Optical ◽  
Water Soluble ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Time Domains ◽  
Soluble Zinc

Synthesis and measurements of third order nonlinear optical (NLO) coefficients of water soluble zinc octacarboxy phthalocyanine (ZnOCPc) are reported here using different laser pulse durations. Nonlinear absorption and refraction behaviour in the nanosecond (ns), picosecond (ps) and femtosecond (fs) time domains were studied in detail. Three-photon absorption was the prevalent mechanism with femtosecond laser excitation whereas strong reverse saturable absorption due to dominant two-photon absorption (TPA) was observed with picosecond and nanosecond excitations. We have evaluated the sign and magnitude of the third order nonlinearity in fs, ps, and ns regimes. We observed large off-resonant second order hyperpolarizability (γ) with ultrafast nonlinear optical response in the femtosecond domain using degenerate four wave mixing (DFWM) technique. We also report the optical limiting characteristics and figure of merit (FOM) of ZnOCPc for optical switching.

scholarly journals Giant nonlinear optical activity in two-dimensional palladium diselenide

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Juan Yu ◽  
Xiaofei Kuang ◽  
Junzi Li ◽  
Jiahong Zhong ◽  
Cheng Zeng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Photon Absorption ◽  
Metal Chalcogenides ◽  
Potential Candidate ◽  
Two Dimensional ◽  
Optical Effects ◽  
Nonlinear Optical Effects ◽  
Transition Metal Chalcogenides

AbstractNonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect of the nonlinear optical effects for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet region, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe2) that has a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation feature, which is in contrast to other transition metal chalcogenides. Furthermore, the two-photon absorption coefficients of 1–3 layer PdSe2 (β ~ 4.16 × 105, 2.58 × 105, and 1.51 × 105 cm GW−1) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths (αs ~ 32%, 27%, and 24%) were obtained in 1–3 layer PdSe2. Such unique nonlinear optical characteristics make PdSe2 a potential candidate for technological innovations in nonlinear optoelectronic devices.

scholarly journals The Influence of Gold Nanoparticles on Linear and Nonlinear Optical Properties of Liquid Crystal

2019 ◽  
Vol 54 (5) ◽  
Author(s):  
Lamees A. Abdullaha ◽  
Alaa Adnan Rashad ◽  
Nasreen Raheem Jber ◽  
Aseel Ibrahim Mahmood ◽  
Rawa Khalil Ibrahim
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Liquid Crystal ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Uv Spectrum ◽  
Two Photon Absorption ◽  
Linear And Nonlinear

Gold nanoparticles (AuNPs) have been prepared for doping liquid crystal (LC) with different concentrations to study linear and nonlinear optical properties utilizing UV spectrum and Z scan technique, respectively. Z scan methods are performed by He-Ne laser at 632.8 Nanometer wavelength. It is observed that the samples can absorb in the UVA range (280-400 nm). Pure LC has high absorbance and the peak of absorbance decreases when the concentration of AuNPS increases due to the AuNPs. The nonlinear optical (NLO) properties of LC were improved by increasing the concentration of AuNPs. The presence of AuNPs changed the behavior of pure LC from two-photon absorption (TPA) to saturable absorption.

scholarly journals The Broadband Nonlinear Optical Response in Graphene/MoS2/Ag Thin Films at Near Infrared

2021 ◽  
Vol 8 ◽  
Author(s):  
Di Sun ◽  
Yu Fang ◽  
Xiaoyan Yan ◽  
Wen Shan ◽  
Wenjun Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Free Carrier Absorption

Graphene/MoS2/Ag thin films were successfully prepared by the magnetron sputtering technique and liquid phase exfoliation. Structure, morphology, optical properties, and nonlinear optical characteristics of the graphene/MoS2/Ag and graphene/MoS2 thin films were studied by X-ray diffractometer, spectrophotometer, field-scanning electron microscope, and femtosecond (fs) Z-scan technique. The results of the fs Z-scan experiment indicate that the graphene/MoS2/Ag thin films exhibit reverse saturable absorption properties due to the free carrier absorption and two-photon absorption. More importantly, with the increase of DC magnetron sputtering power (from 5 to 15 W), the local surface plasmon resonance effect of the Ag thin films increases, which leads to the enhancement of nonlinear optical properties of the graphene/MoS2/Ag thin films. The nonlinear absorption coefficients of the graphene/MoS2/Ag thin films are increased from 1.14 × 10–10 to 1.8 × 10–10 m/W at 800 nm and from 4.79 × 10–11 to 6.79 × 10–11 m/W at 1,030 nm, and the nonlinear refraction index of the graphene/MoS2/Ag thin films is -4.37 × 10–17∼−4.18 × 10–16 m2/W under the excitation of 800 and 1,030 nm, respectively. Moreover, when the graphene/MoS2/Ag thin films were excited at 800 and 1,030 nm, respectively, the nonlinear figure of merit values of the graphene/MoS2/Ag thin films are increased from 1.23 to 2.91 and from 1.30 to 1.47, which are enough to support the application of the graphene/MoS2/Ag thin films in the field of all-optical switching applications.

Enhanced luminescence and nonlinear optical properties of nanocomposites of ZnO–Cu

2008 ◽  
Vol 23 (11) ◽  
pp. 2836-2845 ◽  
Author(s):  
Litty Irimpan ◽  
V.P.N. Nampoori ◽  
P. Radhakrishnan
Keyword(s):  
Optical Properties ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Volume Fraction ◽  
Nonlinear Optical Properties ◽  
Visible Emission ◽  
Photon Absorption ◽  
Nonlinear Material ◽  
Saturable Absorption ◽  
Uv Emission

In this article, we present the spectral and nonlinear optical properties of ZnO–Cu nanocomposites prepared by colloidal chemical synthesis. The emission consisted of two peaks. The 385-nm ultraviolet (UV) peak is attributed to ZnO and the 550-nm visible peak is attributed to Cu nanocolloids. Obvious enhancement of UV and visible emission of the samples is observed and the strongest UV emission of a typical ZnO–Cu nanocomposite is over three times stronger than that of pure ZnO. Cu acts as a sensitizer and the enhancement of UV emission are caused by excitons formed at the interface between Cu and ZnO. As the volume fraction of Cu increases beyond a particular value, the intensity of the UV peak decreases while the intensity of the visible peak increases, and the strongest visible emission of a typical ZnO–Cu nanocomposite is over ten times stronger than that of pure Cu. The emission mechanism is discussed. Nonlinear optical response of these samples is studied using nanosecond laser pulses from a tunable laser in the wavelength range of 450–650 nm, which includes the surface plasmon absorption (SPA) band. The nonlinear response is wavelength dependent and switching from reverse saturable absorption (RSA) to saturable absorption (SA) has been observed for Cu nanocolloids as the excitation wavelength changes from the low absorption window region to higher absorption regime near the SPA band. However, ZnO colloids and ZnO–Cu nanocomposites exhibit induced absorption at this wavelength. Such a changeover in the sign of the nonlinearity of ZnO–Cu nanocomposites, with respect to Cu nanocolloids, is related to the interplay of plasmon band bleach and optical limiting mechanisms. The SA again changes back to RSA when we move over to the infrared region. The ZnO–Cu nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behavior. The nonlinear refractive index and the nonlinear absorption increases with increasing Cu volume fraction at 532 nm. The observed nonlinear absorption is explained through two-photon absorption followed by weak free-carrier absorption and interband absorption mechanisms. This study is important in identifying the spectral range and composition over which the nonlinear material acts as a RSA-based optical limiter. ZnO–Cu is a potential nanocomposite material for the light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.

Hyperbranched lutecium phthalocyanines grafted ethylenediamine@graphene oxide with enhanced nonlinear optical properties

2020 ◽  
Vol 24 (08) ◽  
pp. 1038-1046
Author(s):  
Zengduo Cui ◽  
Xin Wang ◽  
Jiale Ding ◽  
Yunhe Zhang ◽  
Zhenhua Jiang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Organic Solvent ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Polymeric Matrix ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption

To enhance the nonlinear optical properties of graphene oxide in organic solvent and polymeric matrix, lutecium phthalocyanines (LuPc) and hyperbranched lutecium phthalocyanines (HBLuPc) have been grafted on the surface of graphene oxide, respectively. After the surficial modification, the electron transfer process between phthalocyanines and graphene oxide has been also facilitated, resulting in significant fluorescence quenching. Given the combination of nonlinear scattering, two-photon absorption with reverse saturable absorption and the photo-induced electron or energy transfer from the electron donor (phthalocyanine moiety) to the acceptor (graphene oxide), stronger nonlinear optical properties can be realized based on graphene oxide hybrids compared with graphene oxide and phthalocyanines. Furthermore, graphene oxide hybrid modified by hyperbranched lutecium phthalocyanines exhibits the best optical limiting response and the highest nonlinear extinction coefficient at 532 nm in both organic solvent and polymeric matrix. Interestingly, we also find that it could exhibit better optical limiting properties than those possessed by pure phthalocyanine at 1064 nm.

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