Strain-free Ge/GeSiSn quantum cascade lasers based on L-valley intersubband transitions
The authors propose a Ge/Ge0.76Si0.19Sn0.05 quantum cascade laser using intersubband transitions at L valleys of the conduction band which has a “clean” offset of 150 meV situat...
The authors propose a Ge/Ge0.76Si0.19Sn0.05 quantum cascade laser using intersubband transitions at L valleys of the conduction band which has a “clean” offset of 150 meV situat...
Extraordinary optical transmission with coaxial apertures
Recently it has been predicted that “cylindrical” surface plasmons (CSP's) on cylindrical interfaces of coaxial ring apertures produce a different form of extraordinary optical transmissio...
Recently it has been predicted that “cylindrical” surface plasmons (CSP's) on cylindrical interfaces of coaxial ring apertures produce a different form of extraordinary optical transmissio...
Extended conjugation and donor-acceptor substitution to improve the third-order optical nonlinearity of small molecules
Appl. Phys. Lett. 90, 251106 (2007); doi:10.1063/1.2750396
Published 20 June 2007
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The authors use donor-acceptor substitution to increase the third-order polarizability 
of small cyanoethynylethene molecules by lowering the energy corresponding to the first optical transition. They identify a weak power-law dependence for depending on the number of conjugated electrons that separate the donor and acceptors (N1.5), which is the result of the two competing contributions that depend on the conjugation length: the energy separation of the ground and first excited states and the strength of the transition dipole matrix elements. The molecules are highly efficient with respect to their small masses and fall within a factor of 50 of the theoretical limit for centrosymmetric molecules, putting them among the best molecules measured to date.
©2007 American Institute of Physics
of small cyanoethynylethene molecules by lowering the energy corresponding to the first optical transition. They identify a weak power-law dependence for depending on the number of conjugated electrons that separate the donor and acceptors (N1.5), which is the result of the two competing contributions that depend on the conjugation length: the energy separation of the ground and first excited states and the strength of the transition dipole matrix elements. The molecules are highly efficient with respect to their small masses and fall within a factor of 50 of the theoretical limit for centrosymmetric molecules, putting them among the best molecules measured to date.
©2007 American Institute of Physics
| History: | Received 13 April 2007; accepted 26 May 2007; published 20 June 2007 |
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http://link.aip.org/link/?APPLAB/90/251106/1 |
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