Download or read book Impact of Strong Coupling on Chemical Properties and Nonlinear Response of Organic Semiconductors written by Nina Krainova and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polariton chemistry is an emerging and intriguing field that seeks to address a fundamental question: Can we modify and control molecular properties by shaping the optical environment? By hybridizing light and matter and creating quasi-states that possess the properties of both, known as polaritons, can molecules harness photonic characteristics? We focus on intermolecular interactions in a strong light-matter coupling regime. More specifically, our research centers on the investigation of charge transfer events, with photocurrent or photoluminescence serving as our observables. For our photocurrent study, we looked into the photoexcitation of charged molecules, which transform into polaron-polaritons in a strong coupling regime. Fascinatingly, we have discovered evidence of an accelerated charge-transfer process when charged molecules are strongly coupled to light, as opposed to when they are not. The key finding lies in the distinct bias dependence observed between weakly and strongly coupled charged molecules within the same photonic structure. Weaker bias dependence of strongly coupled molecules, according to Onsager theory, indicates that a photoexcited polaron hops further away from its counter anion compare to weakly coupled case. Thus, we conclude that strong coupling regime enhances the intermolecular charge transfer rate. We explain the effect by considering the delocalized nature of polaritons and their ability to simultaneously sample all strongly coupled molecules, benefiting from molecules with fast charge-transfer rates. In our photoluminescence study, we sought a means to harness a donor exciton in donor-acceptor blends that feature high donor concentrations through the application of strong light-matter coupling. Our motivation was to utilize the delocalized nature of photons to promote the transmission of excitation from a distant donor to a donor in close proximity to an acceptor, thereby facilitating the formation of a charge-transfer state. We investigated two distinct systems in which exciton-polaritons originate from the first and second excited states of singlet excitons. Regrettably, we did not observe any systematic trends in the emission spectrum between excitons in strong and weak coupling regimes. We argue that temperature plays a critical role, and only at cryo temperatures where the coherent lifetime is much longer can the effect be observed. Unfortunately, unlike our photocurrent study, our investigation of the photoluminescence was conducted at room temperature. In the latter part of our research, we attempt to understand the effect of strong coupling on the nonlinear optical response of molecules. Specifically, we study electroabsorption (EA) which is responsible for the imaginary part of chi3 nonlinearity. We predict that the molecule with a degenerate excited state will have both linear and quadratic field dependencies of its EA response. Remarkably, we observe that the functional dependence of the EA response on the bias for the lower polariton (LP) strongly varies along the LP dispersion curve. When lower polariton approaches the energy of the uncoupled transition, its bias dependence becomes more quadratic; alternatively, when the energy of LP father away from the transition, the bias dependence is more linear. Furthermore, for both the uncoupled transition and middle polariton we observe the same strongly quadratic bias dependence, distinctly different from that for the lower polariton. Lastly, we have established the groundwork for an exploration of chi2 nonlinearity in an anisotropic organic crystal. We have verified the strong coupling regime for a primal crystal axis by altering the energy of an optical mode. We do not observe a strong coupling signature for light with polarization perpendicular to the primal crystal axis. We witness the strongest second harmonic signal when the incident light (fundamental) has twice the wavelength of the lower polariton, however, at the same time similar magnitude enhancement of SHG occurs at DBR sidebands. This preliminary finding undermines the notion that an exciton-polariton possesses strong hyperpolarizability. Additional measurements are suggested in the last chapter to solidify our findings.
Download or read book Charged Polaritons in Organic Semiconductor Microcavities written by Chiao Yu Cheng and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between light and matter presents an exciting field for both fundamental research and the development of novel optical devices. One promising approach to achieve this interaction is through semiconductor microcavities, where the coupling between light and matter can be particularly strong. When the interaction between the cavity photon and the exciton in the semiconductor material is much faster than their decay processes, the system is referred to as strongly coupled. This coupling leads to the formation of new eigenstates known as exciton-polaritons, which are quasiparticles that have garnered significant attention due to their unique properties arising from their hybrid light-matter nature. We initiate our study by developing a novel platform to showcase the phenomenon of strong coupling between light and polaron optical excitations in a doped organic semiconductor microcavity at room temperature. Following that, we examined the characteristics and workings of the system's emission mechanism. Our findings, when subjected to non-resonant excitation, are consistent with the traditional dipole emission model. This suggests that the radiative population of polariton states in this system is mainly accomplished via fluorescence originating from the polaron excited state reservoir. These findings represent one of the initial observations of polaron luminescence from an organic semiconductor thin film, laying the groundwork for the realization of a charged polariton condensate. The second major theme of this work involves understanding when molecular polaritons are more than just a simple cavity filtering effect on the underlying exciton or should be treated as genuinely new states that can influence the physical/chemical properties of a system. The objective of the research is to explore the electroabsorption (EA) behavior of organic semiconductor microcavities and how their nonlinear optical response is influenced by the strong light-matter coupling. The results suggest that strong coupling can be used to manipulate EA from organic microcavities, but it does not alter the intrinsic optical nonlinearity of the organic semiconductor inside the cavity.
Download or read book Polariton Chemistry written by Joel Yuen-Zhou and published by . This book was released on 2023-05-09 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a pedagogical introduction to the emerging field of Polariton Chemistry, where optical cavities are utilized to control the physicochemical properties and dynamics of molecular systems. Given the early stages of this interdisciplinary research area, it is important to provide a common language and starting point for interested researchers across Chemistry, Physics, and Engineering This edited compendium fills a void given that there is currently no analogue in the current literature. Topics covered include Single-Molecule Strong Light-Matter Coupling; Collective Strong Light-Matter Coupling; and Ultrastrong Light-Matter Coupling
Download or read book Strong Light matter Coupling written by Leong Chuan Kwek and published by World Scientific. This book was released on 2013-12-23 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics of strong light-matter coupling has been addressed in different scientific communities over the last three decades. Since the early eighties, atoms coupled to optical and microwave cavities have led to pioneering demonstrations of cavity quantum electrodynamics, Gedanken experiments, and building blocks for quantum information processing, for which the Nobel Prize in Physics was awarded in 2012. In the framework of semiconducting devices, strong coupling has allowed investigations into the physics of Bose gases in solid-state environments, and the latter holds promise for exploiting light-matter interaction at the single-photon level in scalable architectures. More recently, impressive developments in the so-called superconducting circuit QED have opened another fundamental playground to revisit cavity quantum electrodynamics for practical and fundamental purposes. This book aims at developing the necessary interface between these communities, by providing future researchers with a robust conceptual, theoretical and experimental basis on strong light-matter coupling, both in the classical and in the quantum regimes. In addition, the emphasis is on new forefront research topics currently developed around the physics of strong light-matter interaction in the atomic and solid-state scenarios.
Download or read book Polaritonic Chemistry written by Javier Galego Pascual and published by Springer Nature. This book was released on 2020-06-25 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polaritonic chemistry is an emergent interdisciplinary field in which the strong interaction of organic molecules with confined electromagnetic field modes is exploited in order to manipulate the chemical structure and reactions of the system. In the regime of strong light-matter coupling the interaction with the electromagnetic vacuum obliges us to redefine the concept of a molecule and consider the hybrid system as a whole. This thesis builds on the foundations of chemistry and quantum electrodynamics in order to provide a theoretical framework to describe these organic light-matter hybrids. By fully embracing the structural complexity of molecules, this theory allows us to employ long-established quantum chemistry methods to understand polaritonic chemistry. This leads to predictions of substantial structural changes in organic molecules and the possibility of significantly influencing chemical reactions both in the excited and ground states of the system.
Download or read book Electronic Properties of Conjugated Polymers written by Hans Kuzmany and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with electrical, electrochemical, structural, magnetic, optical and lattice dynamical properties of conjugated polymers such as polyaniline, polyacetylene, polydiacetylene, polypyrrole, polyparaphenylene and polythiophene. Several new conjugated systems and model polyenes are also considered. Since the previous winter school on this topic held in 1985, the focus of interest in the field has broadened and now covers not only conductivity and relaxation phenomena of polyacetylene but also nonlinear optical properties, highly oriented and single crystal polymers, and electrochemical and opto-electrochemical properties of special materials. Particular attention is paid in this volume to the possible applications of these systems, for example, in electrochemical cells as electrode materials and in nonlinear optics devices, which now appear to be much more realistic than previously. The detailed contributions are complemented by short reviews of thin film polymers (Langmuir-Blodgett layers), filled polymers, ferromagnetic polymers, superconducting low-dimensional systems (including organic superconductors and high-temperature superconductors) and the application of fractal models to polymers.
Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1970 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Nanoscience and Technology written by and published by Academic Press. This book was released on 2010-10-29 with total page 2785 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Optoelectronic Materials written by Yongfang Li and published by Springer. This book was released on 2015-05-30 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the latest trends in organic optoelectronic materials. Each comprehensive chapter allows graduate students and newcomers to the field to grasp the basics, whilst also ensuring that they have the most up-to-date overview of the latest research. Topics include: organic conductors and semiconductors; conducting polymers and conjugated polymer semiconductors, as well as their applications in organic field-effect-transistors; organic light-emitting diodes; and organic photovoltaics and transparent conducting electrodes. The molecular structures, synthesis methods, physicochemical and optoelectronic properties of the organic optoelectronic materials are also introduced and described in detail. The authors also elucidate the structures and working mechanisms of organic optoelectronic devices and outline fundamental scientific problems and future research directions. This volume is invaluable to all those interested in organic optoelectronic materials.
Download or read book Physics of Semiconductors written by Wolfgang Jantsch and published by American Institute of Physics. This book was released on 2007 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features peer-reviewed papers that were presented at the 28th International Conference on the Physics of Semiconductors. This biannual conference presents and discusses all important developments and outstanding recent results in the field of semiconductor physics: one of the most important disciplines in solid state physics. Semiconductor physics provides the scientific basis for the microelectronic device industry.
Download or read book Publications of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1968 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Halide Perovskites written by Tze-Chien Sum and published by John Wiley & Sons. This book was released on 2019-03-25 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real insight from leading experts in the field into the causes of the unique photovoltaic performance of perovskite solar cells, describing the fundamentals of perovskite materials and device architectures. The authors cover materials research and development, device fabrication and engineering methodologies, as well as current knowledge extending beyond perovskite photovoltaics, such as the novel spin physics and multiferroic properties of this family of materials. Aimed at a better and clearer understanding of the latest developments in the hybrid perovskite field, this is a must-have for material scientists, chemists, physicists and engineers entering or already working in this booming field.
Download or read book Electronic Processes in Organic Semiconductors written by Anna Köhler and published by John Wiley & Sons. This book was released on 2015-06-08 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first advanced textbook to provide a useful introduction in a brief, coherent and comprehensive way, with a focus on the fundamentals. After having read this book, students will be prepared to understand any of the many multi-authored books available in this field that discuss a particular aspect in more detail, and should also benefit from any of the textbooks in photochemistry or spectroscopy that concentrate on a particular mechanism. Based on a successful and well-proven lecture course given by one of the authors for many years, the book is clearly structured into four sections: electronic structure of organic semiconductors, charged and excited states in organic semiconductors, electronic and optical properties of organic semiconductors, and fundamentals of organic semiconductor devices.
Download or read book Organic Materials for Non linear Optics written by R. A. Hann and published by CRC Press. This book was released on 1989 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication represents the proceedings of the Conference on Organic Materials for Non-Linear Optics, held in Oxford in June 1988. It was a truly international conference attended by over 160 delegates from academia, industry and government research establishments, who represented a wide range of scientific disciplines and included organic and organometallic chemists, theorists and experimental physicists and device engineers.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
