Dynamics of all-optical switching in polymethine dye molecules
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| Title: | Dynamics of all-optical switching in polymethine dye molecules |
|---|---|
| Authors: | Sharma, Parag1, Roy, Sukhdev sukhdevr@hotmail.com, Singh, C.P. |
| Source: | Thin Solid Films. Apr2005, Vol. 477 Issue 1/2, p42-47. 6p. |
| Subjects: | Polymethines, Laser beams, Electronic circuit design, Vinyl polymers |
| Abstract: | Abstract: All-optical switching has been analyzed in the recently reported Polymethine dye (2-[2-[3-[(1,3-dihydro-3,3-dimethyl-1-phenyl-2H-indol-2-ylidene)ethylidne]-2-phenyl-1-cyclohexene-1-yl] ethenyl]-3,3-dimethyl-1-phenylindolium perchlorate) (PD3) [O.V. Przhonska, D.J. Hagan, E. Novikov, R. Lepkowicz, E.W.V. Stryland, M.V. Bondar, Y.L. Slominsky, A.D. Kachkovski, Chem. Phys. 273 (2001) 235.] that exhibits large excited-state absorption, using the rate equation approach, to achieve high contrast and fast switching. The transmission of a cw probe laser beam (I p) at 532 nm through PD3 dissolved in (i) ethanol and (ii) polyurethane acrylate (PUA), is switched by a pulsed pump laser beam at 532 and 650 nm, respectively, which excite molecules from the ground state. The theoretical results show good agreement with the reported experimental results for case (i). The switching characteristics have been shown to be sensitive to variation in concentration, pump pulse width (Δt), peak pumping intensity (I m0′), absorption cross-section of the excited-state at 532 nm and lifetime of excited-state (τ 1). The same switching contrast can be achieved at relatively lower pump powers at 650 nm for case (ii). It is shown that there is an optimum value of concentration at which maximum modulation can be achieved. We can get 96% modulation of I p at I m0′=1 GW/cm2 at 650 nm, with Δt=30 ps and concentration of 0.14 mM in PUA, resulting in switch off and on time of 95 ps and 18 ns, respectively. The results have also been used to design all-optical NOT and the universal NOR and NAND logic gates with multiple pump laser pulses, which are the basic building blocks of computing circuits. [Copyright &y& Elsevier] |
| Copyright of Thin Solid Films is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 17445385 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dynamics of all-optical switching in polymethine dye molecules – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sharma%2C+Parag%22">Sharma, Parag</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Roy%2C+Sukhdev%22">Roy, Sukhdev</searchLink><i> sukhdevr@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Singh%2C+C%2EP%2E%22">Singh, C.P.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Thin+Solid+Films%22">Thin Solid Films</searchLink>. Apr2005, Vol. 477 Issue 1/2, p42-47. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Polymethines%22">Polymethines</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+beams%22">Laser beams</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+circuit+design%22">Electronic circuit design</searchLink><br /><searchLink fieldCode="DE" term="%22Vinyl+polymers%22">Vinyl polymers</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: All-optical switching has been analyzed in the recently reported Polymethine dye (2-[2-[3-[(1,3-dihydro-3,3-dimethyl-1-phenyl-2H-indol-2-ylidene)ethylidne]-2-phenyl-1-cyclohexene-1-yl] ethenyl]-3,3-dimethyl-1-phenylindolium perchlorate) (PD3) [O.V. Przhonska, D.J. Hagan, E. Novikov, R. Lepkowicz, E.W.V. Stryland, M.V. Bondar, Y.L. Slominsky, A.D. Kachkovski, Chem. Phys. 273 (2001) 235.] that exhibits large excited-state absorption, using the rate equation approach, to achieve high contrast and fast switching. The transmission of a cw probe laser beam (I p) at 532 nm through PD3 dissolved in (i) ethanol and (ii) polyurethane acrylate (PUA), is switched by a pulsed pump laser beam at 532 and 650 nm, respectively, which excite molecules from the ground state. The theoretical results show good agreement with the reported experimental results for case (i). The switching characteristics have been shown to be sensitive to variation in concentration, pump pulse width (Δt), peak pumping intensity (I m0′), absorption cross-section of the excited-state at 532 nm and lifetime of excited-state (τ 1). The same switching contrast can be achieved at relatively lower pump powers at 650 nm for case (ii). It is shown that there is an optimum value of concentration at which maximum modulation can be achieved. We can get 96% modulation of I p at I m0′=1 GW/cm2 at 650 nm, with Δt=30 ps and concentration of 0.14 mM in PUA, resulting in switch off and on time of 95 ps and 18 ns, respectively. The results have also been used to design all-optical NOT and the universal NOR and NAND logic gates with multiple pump laser pulses, which are the basic building blocks of computing circuits. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Thin Solid Films is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.tsf.2004.08.109 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 42 Subjects: – SubjectFull: Polymethines Type: general – SubjectFull: Laser beams Type: general – SubjectFull: Electronic circuit design Type: general – SubjectFull: Vinyl polymers Type: general Titles: – TitleFull: Dynamics of all-optical switching in polymethine dye molecules Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sharma, Parag – PersonEntity: Name: NameFull: Roy, Sukhdev – PersonEntity: Name: NameFull: Singh, C.P. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 04 Text: Apr2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 00406090 Numbering: – Type: volume Value: 477 – Type: issue Value: 1/2 Titles: – TitleFull: Thin Solid Films Type: main |
| ResultId | 1 |
