1
|
Non-volatile optical memory based on cooperative orientation switching: improvement of recording speed and contrast by utilizing out-of-plane orientation mode. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2023; 22:857-865. [PMID: 36635601 DOI: 10.1007/s43630-022-00357-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 12/22/2022] [Indexed: 01/14/2023]
Abstract
Herein, we report a novel strategy toward non-volatile optical memory with high-contrast, high-speed recording, and non-destructive readout capability based on the cooperative out-of-plane orientation of a fluorescent dye doped into azobenzene liquid crystalline polymer film. By employing the out-of-plane orientation switching upon irradiation with UV light and thermal heating, high-contrast turn-on fluorescence switching was successfully achieved and the optical recording was demonstrated with non-destructive fluorescence readout capability. Furthermore, the recording speed and the fluorescence on/off contrast in the present system were dramatically improved compared to the previous in-plane orientation mode.
Collapse
|
2
|
Orgiu E, Samorì P. 25th anniversary article: organic electronics marries photochromism: generation of multifunctional interfaces, materials, and devices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:1827-1845. [PMID: 24554562 DOI: 10.1002/adma.201304695] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 01/13/2014] [Indexed: 06/03/2023]
Abstract
Organic semiconductors have garnered significant interest as key components for flexible, low-cost, and large-area electronics. Hitherto, both materials and processing thereof seems to head towards a mature technology which shall ultimately meet expectations and efforts built up over the past years. However, by its own organic electronics cannot compete or complement the silicon-based electronics in integrating multiple functions in a small area unless novel solutions are brought into play. Photochromic molecules are small organic molecules able to undergo reversible photochemical isomerization between (at least) two (meta)stable states which exhibit markedly different properties. They can be embedded as additional component in organic-based materials ready to be exploited in devices such as OLEDs, OFETs, and OLETs. The structurally controlled incorporation of photochromic molecules can be done at various interfaces of a device, including the electrode/semiconductor or dielectric/semiconductor interface, or even as a binary mixture in the active layer, in order to impart a light responsive nature to the device. This can be accomplished by modulating via a light stimulus fundamental physico-chemical properties such as charge injection and transport in the device.
Collapse
Affiliation(s)
- Emanuele Orgiu
- Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS, 8 allée Gaspard Monge, 67000, Strasbourg, France
| | | |
Collapse
|
3
|
Nakagawa H, Kawai S, Nakashima T, Kawai T. Synthesis and Photochemical Reactions of Photochromic Terarylene Having a Leaving Methoxy Group. Org Lett 2009; 11:1475-8. [DOI: 10.1021/ol802969b] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hisako Nakagawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan
| | - Shigekazu Kawai
- Graduate School of Materials Science, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan
| | - Takuya Nakashima
- Graduate School of Materials Science, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan
| | - Tsuyoshi Kawai
- Graduate School of Materials Science, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan
| |
Collapse
|
4
|
Guo H, Zhuang S, Chen J, Liang Z. Multilayered optical memory with bits stored as refractive index change. I. Electromagnetic theory. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2007; 24:1776-85. [PMID: 17491648 DOI: 10.1364/josaa.24.001776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
With the Lippman-Schwinger equation, dyadic Green's functions, and the vector coherent transfer function method, an electromagnetic theory of a waveguide multilayered optical memory is first developed for the static case, from which a theory describing a conventional multilayered optical memory with bits stored as a refractive index change is also derived. In addition, the formulas for readout signals and cross talk are given, and some problems of numerical calculations are discussed. The theories can be used effectively for optimum design of a multilayered optical memory with bits stored as a refractive index change.
Collapse
Affiliation(s)
- Hanming Guo
- Shanghai Key Laboratory of Contemporary Optics System, College of Optics and Electronic Information Engineering, University of Shanghai for Science and Technology, China.
| | | | | | | |
Collapse
|
5
|
Li Y, Deng Y, He Y, Tong X, Wang X. Amphiphilic azo polymer spheres, colloidal monolayers, and photoinduced chromophore orientation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:6567-71. [PMID: 15982068 DOI: 10.1021/la050082a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In this work, azobenzene-containing colloidal spheres have been fabricated and used to construct photoresponsive monolayers. The colloidal spheres were prepared from an amphiphilic azobenzene-containing random copolymer through hydrophobic aggregation of the polymer chains, which was induced by adding the selective solvent (H2O) into a THF solution of the polymer. The size and size distribution of the spheres depended on the initial concentration of the azo polymer in THF and the H2O/THF ratio. Adjusting those factors and optimizing other preparation conditions, uniform colloidal spheres could be obtained. Monolayers composed of hexagonally close-packed colloidal spheres were prepared by the capillary-force-driven method. The colloidal monolayers showed obvious dichroism after laser irradiation due to the photoinduced azo-chromophore orientation occurred in the spheres. The orientation order parameter was related to the irradiation time and estimated to be 0.09 at the photostationary state. The colloidal spheres and their monolayers can potentially be used as building blocks or media for reversible optical data storage, photo-switching, sensors, and other photo-driven devices.
Collapse
Affiliation(s)
- Yaobang Li
- Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China
| | | | | | | | | |
Collapse
|
6
|
|
7
|
Hasegawa M, Ikawa T, Tsuchimori M, Watanabe O, Kawata Y. Topographical Nanostructure Patterning on the Surface of a Thin Film of Polyurethane Containing Azobenzene Moiety Using the Optical Near Field around Polystyrene Spheres. Macromolecules 2001. [DOI: 10.1021/ma0102870] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Makoto Hasegawa
- Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Taiji Ikawa
- Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Masaaki Tsuchimori
- Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Osamu Watanabe
- Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Yoshimasa Kawata
- Faculty of Engineering, Shizuoka University, Johoku, Hamamatsu 432-8561, Japan
| |
Collapse
|
8
|
|
9
|
Yoshikawa H, Masuhara H. Near-field fluorescence spectroscopy and photochemistry of organic mesoscopic materials. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2000. [DOI: 10.1016/s1389-5567(00)00005-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
10
|
Kawata S, Kawata Y. Three-Dimensional Optical Data Storage Using Photochromic Materials. Chem Rev 2000; 100:1777-1788. [PMID: 11777420 DOI: 10.1021/cr980073p] [Citation(s) in RCA: 799] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Satoshi Kawata
- Department of Applied Physics, Osaka University, Suita, Osaka, 565-0871, Japan, and Department of Mechanical Engineering, Shizuoka University, Johoku, Hamamatsu, 432-8561, Japan
| | | |
Collapse
|
11
|
Tsujioka T, Irie M. Theoretical study of signal-to-noise ratio on near-field photochromic memory with fluorescence readout. APPLIED OPTICS 1999; 38:5066-5072. [PMID: 18323999 DOI: 10.1364/ao.38.005066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The signal-to-noise ratio (SNR) on the fluorescence readout of a near-field photochromic memory was theoretically studied. Under various conditions the shot-noise-limited SNR was analyzed. SNR by bright spot recording (BSR) that was better than that by dark spot recording (DSR) was obtained under the condition of low writing power or wide bandwidth. Under the condition of bandwidth W = 1 MHz and P(write) = 10(-8) W only BSR can attain sufficiently high SNR, and the SNR was greater by as much as 30 dB than that of DSR. It was concluded that BSR is a promising method for high-density near-field photochromic memory with a fluorescence readout.
Collapse
Affiliation(s)
- T Tsujioka
- New Materials Research Center, SANYO Electric Company, Ltd, 1-18-13 Hashiridani, Hirakata-City, Osaka 573, Japan
| | | |
Collapse
|