Article
Biochemistry & Molecular Biology
Yanbing Han, Jinchong Xiao, Xingzhi Wu, Yuxiao Wang, Xueru Zhang, Yinglin Song
Summary: A novel two-branched twistacene has been synthesized with excellent two photon absorption and excited singlet state absorption, making it a promising candidate for ultrafast optical limiting.
Article
Chemistry, Applied
Yanbing Han, Jinchong Xiao, Xingzhi Wu, Yuxiao Wang, Xueru Zhang, Yinglin Song
Summary: A series of twistacenes were designed and synthesized based on theoretical analysis of the natural transition orbitals. These twistacenes showed two photon absorption and unique broadband excited singlet state absorption features, which were confirmed by various experimental methods. One of the screened twistacenes exhibited excellent optical limiting behavior, making it a promising candidate for nonlinear optical applications.
Article
Nanoscience & Nanotechnology
Wan Feng, Ke Liu, Jianyang Zang, Gang Wang, Rong Miao, Liping Ding, Taihong Liu, Jinglin Kong, Yu Fang
Summary: The structure-property relationship of fluorophores with favorable nonlinear optical properties was studied by synthesizing a series of terthiophene-o-carborane dyads and triads. It was found that the carborane unit has a significant impact on introducing the aggregation-induced emission characteristic. These fluorophores exhibit good photoluminescence in solid states and have potential applications in optical limiting.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
B. Vijayakumar, K. Mani Rahulana, R. Annie Sujathaa, M. Durairajb, T. C. Sabari Girisunb, N. Angeline Little Flower
Summary: The nonlinear optical limiting properties of pure and Co2+ doped monoclinic LaPO4 nanostructures synthesized by co-precipitation technique are investigated. The structure confirmation of Co2+ doped LaPO4 nanostructures is studied using X-ray diffraction (XRD) and Raman spectra. Co2+ doping resulted in the replacement of larger La3+ ion by smaller Co2+ ion. Optical characterizations revealed blue shift in absorption edge and enhanced nonlinear absorption in Co2+ doped LaPO4 nanostructures.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
M. Durairaj, T. C. Sabari Girisun
Summary: Lanthanide-doped cerium oxide and yttrium oxide upconverter nanoparticles were synthesized and heterostructures with MoS2 were formed. XRD and Raman analysis confirmed the formation of heterostructures. FESEM revealed the dispersion of nanoparticles and nanospindles on MoS2 nanoplatelets. The heterostructure formation affected the diameter and length of the nanoparticles. The upconverters exhibited maximum absorption in the UV region and displayed interesting luminescence behavior. Nonlinear absorption characteristics measured by Z-scan technique indicated that the MoS2-CeO2: Yb, Er and MoS2-Y2O3: Yb, Er heterostructures had high nonlinear absorption coefficients and low limiting thresholds.
Article
Materials Science, Multidisciplinary
Guanzheng Song, Xingzhi Wu, Wenfa Zhou, Jinchong Xiao, Xueru Zhang, Yuxiao Wang, Yinglin Song
Summary: A novel symmetrical heteroacenes compound JPC-42 was synthesized and its nonlinear optical properties were investigated under 532 nm excitation conditions. The compound with twisted structure showed a superior optical limiting response, achieving extremely high transmittance (91% at 532 nm) and low OL threshold (3 x 10-3 J/cm2 in the femtosecond regime, 130 x 10-3 J/cm2 in the picosecond regime). These results highlight the potential of this twist-acene compound as a promising candidate in laser protection fields.
Article
Materials Science, Multidisciplinary
D. Mary Deena, A. Dhanusha, T. C. Sabari Girisun, A. Philominal
Summary: The nonlinear absorption and optical limiting properties of rGO/MnO2, NrGO/MnO2 and NrGO/MnO2/WO3 nanostructures induced by nanopulsed Nd:YAG green laser were investigated for the first time using single beam Z-scan experiment. It was found that MnO2 decorated NrGO had a higher two-photon absorption coefficient and the lowest optical limiting threshold.
Article
Chemistry, Physical
Koushik Mondal, Subrata Biswas, Tara Singha, Udit Chatterjee, Prasanta K. Datta, Pathik Kumbhakar
Summary: The synthesis of Au nanodusters with Au1NC and Au2NC in colloidal solution demonstrates strong and stable blue luminescence with high quantum yield. The nonlinear optical two-photon absorption properties of these materials are studied for the first time, showing reverse saturable absorption behavior and high third-order nonlinear susceptibility under laser excitation. Additionally, the synthesized AuNCs exhibit excellent optical power limiting phenomenon, making them promising for future photonics applications.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Sylvain David, Hao-Jung Chang, Cesar Lopes, Carl Braennlund, Boris Le Guennic, Gerard Berginc, Eric Van Stryland, Mykailo Bondar, David Hagan, Denis Jacquemin, Chantal Andraud, Olivier Maury
Summary: This study describes aza-boron dipyrromethenes with benzothiadiazole substitutions and investigates the impact of these substitutions on intramolecular charge transfer. The benzothiadiazole moiety enhances accepting strength, leading to improved optical power limiting performances. The substituted dyes show significantly enhanced two-photon absorption, making them a good starting point for further improvement of optical power limiting in the short-wave IR range.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Brandon J. Furey, Benjamin J. Stacy, Tushti Shah, Rodrigo M. Barba-Barba, Ramon Carriles, Alan Bernal, Bernardo S. Mendoza, Brian A. Korgel, Michael C. Downer
Summary: Colloidal nanocrystalline silicon quantum dots (nc-SiQDs) excited by two-photon in the near-infrared (NIR) range have potential applications in deep biological imaging. The two-photon absorption (2PA) cross section of colloidal nc-SiQDs is measured, and it is found to be smaller for smaller diameter nanocrystals. The efficiencies of nc-SiQDs for bioimaging using two-photon excited photoluminescence (2PE-PL) are compared to other quantum dots and molecular fluorophores and found to be comparable or superior at greater depths.
Article
Nanoscience & Nanotechnology
B. Vijayakumar, K. Mani Rahulan, R. Annie Sujatha, M. Durairaj, T. C. Sabari Girisun, N. Angeline Little Flower
Summary: Pure and Bi3+-doped CePO4 were synthesized using co-precipitation method. The structure analysis, X-ray diffraction, and Raman characterization confirmed the successful incorporation of dopants into the host lattice without changing the crystal structure. Morphological investigation showed the coexistence of nanospheres and nanorods in doped CePO4 and only nanospheres in pure CePO4. X-ray photoelectron spectroscopy studies confirmed the oxidation state of Ce3+ and Bi3+ and the presence of Ce4+ in the nanoparticles. Vibration sample magnetometer studies showed weak ferromagnetic behavior at room temperature. The absorption band in the wavelength range 200-300 nm accounted for electronic transition and there was a red shift in the band edge due to the increased band gap with the addition of dopant. Photoluminescence emission spectra showed broad blue-green emission due to Ce3+ transition and oxygen vacancy. Nonlinear optical absorption and optical limiting behaviors were studied using an open-aperture Z-scan technique, and Bi3+-doped CePO4 showed improved NLA coefficients and lower OL threshold, making it suitable for protecting optical sensors and human eyes.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Ummu Habeeba Abdul Azeez, Dhanusha Ayyappan, T. Sabari Girisun Chidambaram, Ranvijay Singh, Jegadesan Subbiah, Anandan Sambandam
Summary: This study synthesized a series of Schiff-based organic molecules with a phenothiazine backbone and investigated their structural, optical, and nonlinear absorption properties. The Phe-Ma molecule exhibited the highest nonlinear absorption and the lowest optical limiting threshold, indicating its potential as a nonlinear optical limiter.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Materials Science, Ceramics
B. Binish, M. Durairaj, T. C. Sabari Girisun, K. Mani Rahulan
Summary: This article reports the nonlinear properties of unexplored tin-doped barium molybdate (BaMoO4) nanostructures for tunable optical limiting applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jayaramakrishnan Velusamy, Gabriel Ramos-Ortiz
Summary: Metal-doped carbon nanodots (m-CNDs) with tunable optical properties were successfully synthesized via a one-pot solid phase flux technique, showing concentration-dependent optical properties and enhanced performance with sodium doping. The study reveals the potential of m-CNDs for various applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Materials Science, Multidisciplinary
Bekir Asilcan Unlu, Ahmet Karatay, Elif Akhuseyin Yildiz, Mehmet Lutfi Yola, Mustafa Yuksek, Necip Atar, Ayhan Elmali
Summary: The defect-assisted nonlinear absorption and optical limiting performance of hexagonal boron nitride nanosheets in aqueous suspension and in PMMA matrices were studied, showing promising potential for OL applications, especially at 532 nm wavelength.
Article
Materials Science, Multidisciplinary
K. Praveen Kumar Naik, V. Sreeramulu, E. Ramya, K. Muralidharan, D. Narayana Rao
MATERIALS CHEMISTRY AND PHYSICS
(2016)
Article
Chemistry, Physical
E. Ramya, L. Jyothi, D. Narayana Rao
Article
Chemistry, Multidisciplinary
E. Ramya, Nabil Momen, D. Narayana Rao
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2018)
Article
Chemistry, Multidisciplinary
Emusani Ramya, M. Veeramohan Rao, L. Jyothi, D. Narayana Rao
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2018)
Article
Nanoscience & Nanotechnology
E. Ramya, L. Jyothi, N. Sriram Gopal, Narayana Rao Desai
APPLIED NANOSCIENCE
(2018)
Article
Materials Science, Multidisciplinary
Nabil A. Saad, Mudasir H. Dar, E. Ramya, Ram G. Naraharisetty, D. Narayana Rao
JOURNAL OF MATERIALS SCIENCE
(2019)
Article
Nanoscience & Nanotechnology
Emusani Ramya, M. Veeramohan Rao, D. Narayana Rao
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2019)
Article
Chemistry, Physical
Nabil A. Saad, E. Ramya, V Saikiran, Sri Ram G. Naraharisetty, D. Narayana Rao
Article
Chemistry, Multidisciplinary
Emusani Ramya, Dushyant Kushavah, M. Veeramohan RaO, T. Arun Kumar, D. Narayana Rao
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2020)
Article
Nanoscience & Nanotechnology
E. Ramya, L. Jyothi, Narayana Rao Desai
Summary: The study successfully synthesized silver and gold nanoparticles using pomegranate and mandarin extracts, with the extracts acting as capping agents. The research investigated the fluorescence effects of the nanoparticles on certain compounds, as well as their nonlinear optical properties, and analyzed their toxicity and antimicrobial activities.
INTERNATIONAL JOURNAL OF NANOSCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Emusani Ramya, D. Narayana Rao
Summary: This study examines the size-dependent optical properties of semiconductor cadmium tellurite quantum dots (CdTe QDs). The results show that as the size increases, a red shift in absorption and photoluminescence wavelengths is observed. The size of the CdTe QDs ranges from 3 nm to 6 nm. The changes in size also affect the two-photon absorption and reverse saturable absorption in the picosecond region, which is attributed to the behavior of exciton oscillators. These findings suggest that CdTe QDs can be utilized as optical limiters in the visible region.
INTERNATIONAL JOURNAL OF NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
E. Ramya, L. Jyothi, P. Vivek Vardhan, N. Sri Ram Gopal, Narayana Rao Desai
Article
Chemistry, Physical
E. Ramya, Ch. Rajashree, P. L. Nayak, D. Narayana Rao
APPLIED CLAY SCIENCE
(2017)
Proceedings Paper
Physics, Applied
S. K. Pandey, E. Ramya, J. K. S. Gangwar, Palvinder Kaur, Sanjeev Kumar, D. N. Rao, S. M. Rao
ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2015)
(2015)
