Experimental and theoretical studies of surface phonon polariton of AlN thin film

2007 ◽  
Vol 90 (8) ◽  
pp. 081902 ◽  
Author(s):  
S. S. Ng ◽  
Z. Hassan ◽  
H. Abu Hassan
Keyword(s):  
Thin Film ◽  
Theoretical Studies ◽  
Surface Phonon ◽  
Surface Phonon Polariton ◽  
Experimental And Theoretical Studies

SURFACE PHONON AND CONFINED PHONON POLARITONS IN WURTIZTE NITRIDE THIN-FILM STRUCTURES

2008 ◽  
Vol 15 (04) ◽  
pp. 493-501 ◽  
Author(s):  
L. ZHANG
Keyword(s):  
Thin Film ◽  
Electric Field ◽  
Low Frequency ◽  
Film Structure ◽  
Dispersive Equations ◽  
Surface Phonon ◽  
Thin Film Structure ◽  
Frequency Branch ◽  
Surface Phonon Polariton ◽  
Confined Quantum Systems

The polar phonon polariton modes in a wurtzite thin-film structure have been theoretically investigated in the present paper. It has been confirmed that there are two types of phonon polariton modes, i.e., the surface phonon polariton (SPP) modes and the confined phonon polariton (CPP) modes in wurtzite thin-film systems. The frequency ranges of the SPP and CPP modes have been discussed in detail. The dispersive equations for the two types of polarition modes are also deduced. Numerical calculations on a GaN thin-film structure reveal that, for a given free wavenumber kt in x-direction, there are two branches of SPP modes in general. The width of the wurtizte thin film has important influence on the dispersive properties of the polariton modes, especially the width d is small. Our calculated result agrees well with the recent experimental observation in GaN thin-film system. Furthermore, we confirm that the SPP modes observed (at about the frequency of 700 cm-1) is the low-frequency SPP modes. The CPP modes appear in two frequency ranges of [ωzT, GaN ,ωtT, GaN ] and [ωzL, GaN ,ωtL, GaN ]. There are infinite branches of CPP modes in each range. The low-frequency branch, in contrast to the high-frequency branch, is more dispersive. Moreover, the dispersion of lower-order CPP modes is more obvious than that of higher-order CPP ones. At last, the distribution properties of the electric field components Ex(z) for the SPP and CPP modes are discussed and analyzed. It is found that Ex(z) are either symmetrical, or antisymmetrical. The electric field components [Formula: see text] for SPP modes are mainly localized at the surfaces. The distribution properties of electric field components [Formula: see text] are quite analogous to the behaviors of bound electronic states in confined quantum systems. In terms of these features, the CPP modes in the GaN thin film structures are distinguished and labeled.

Theoretical studies of surface phonon polariton in wurtzite AlInN ternary alloy

2011 ◽  
Vol 519 (16) ◽  
pp. 5481-5485 ◽  
Author(s):  
P.K. Ooi ◽  
S.C. Lee ◽  
S.S. Ng ◽  
Z. Hassan ◽  
H. Abu Hassan
Keyword(s):  
Ternary Alloy ◽  
Theoretical Studies ◽  
Surface Phonon ◽  
Surface Phonon Polariton

Hyperfine interaction vs. spin–orbit coupling in organic semiconductors

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111421-111426 ◽  
Author(s):  
L. B. Niu ◽  
L. J. Chen ◽  
P. Chen ◽  
Y. T. Cui ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Hyperfine Interaction ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Orbit Coupling ◽  
Theoretical Studies ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Experimental And Theoretical Studies

We report experimental and theoretical studies on hyperfine interaction vs. spin–orbit coupling in a thin film of organic semiconductor poly[9,9-di-n-hexylfluorenyl-2,7-diyl] and the dramatic influence of doping the PFO with bis[2-(2′-benzothienyl)pyridinato-N,C3′]Ir(acac).

scholarly journals Nonlinear absorption in CuPc-doped PMMA thin film in the femtosecond regime: Experimental and theoretical studies

2008 ◽  
Vol 16 (19) ◽  
pp. 14571 ◽  
Author(s):  
Fang Li ◽  
Peixiang Lu ◽  
Hua Long ◽  
Guang Yang ◽  
Yuhua Li ◽  
...  
Keyword(s):  
Thin Film ◽  
Nonlinear Absorption ◽  
Theoretical Studies ◽  
Femtosecond Regime ◽  
Experimental And Theoretical Studies

Surface phonon polariton characteristics of wurtzite ZnO thin film grown on silicon substrate

2012 ◽  
Vol 249 (5) ◽  
pp. 1058-1062 ◽  
Author(s):  
Sha Shiong Ng ◽  
Poh Kok Ooi ◽  
Sai Cheong Lee ◽  
Mat Johar Abdullah ◽  
Zainuriah Hassan ◽  
...  
Keyword(s):  
Thin Film ◽  
Silicon Substrate ◽  
Zno Thin Film ◽  
Surface Phonon ◽  
Surface Phonon Polariton

Theoretical Studies on Optical Phonon and Surface Phonon Polariton of Wurtzite AlInN Alloys

2015 ◽  
Vol 1107 ◽  
pp. 565-570
Author(s):  
Pauline Yew ◽  
Lee Sai Cheong ◽  
Sha Shiong Ng ◽  
Yoon Tiem Leong ◽  
Haslan Abu Hassan
Keyword(s):  
Optical Phonon ◽  
Mixed Crystal ◽  
Composition Dependence ◽  
Composition Range ◽  
Random Element ◽  
Indium Nitride ◽  
Theoretical Studies ◽  
Nearest Neighbour ◽  
Surface Phonon ◽  
Surface Phonon Polariton

The lattice vibrational properties of wurtzite ternary mixed crystal aluminium indium nitride (AlxIn1-xN) are investigated thoroughly using modified random element iso-displacement (MREI) model and Born-Huang procedure. MREI model, which considers the nearest neighbour interactions, is used to predict the composition dependence of longitudinal and transverse optical phonon frequencies. For AlxIn1-xN alloy, oscillator strength of its weak mode is sufficiently significant for composition range of 0 < x < 0.4. As a result, AlxIn1-xN alloy is deduced to exhibit mixed-mode behaviour. Finally, the calculated dielectric functions for the entire composition range (0 < x < 1) are used to simulate the surface phonon polariton characteristics of the AlxIn1-xN alloy.

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