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The optical absorption coefficient and refractive index changes of aspherical quantum dot placed at the center of a cylindrical nano-wire

Identifieur interne : 000341 ( Main/Repository ); précédent : 000340; suivant : 000342

The optical absorption coefficient and refractive index changes of aspherical quantum dot placed at the center of a cylindrical nano-wire

Auteurs : RBID : Pascal:13-0236207

Descripteurs français

Pascal (Inist)
- Spectre absorption, Coefficient absorption, Indice réfraction, Propriété optique, Forme sphérique, Fonction onde, Point quantique, Nanofil, Arséniure d'indium, Arséniure de gallium, Valeur propre, Modèle masse effective, Méthode élément fini, Effet non linéaire, Temps relaxation, 7820C, InAs, GaAs.

English descriptors

KwdEn :
- Absorption coefficients, Absorption spectra, Effective mass model, Eigenvalues, Finite element method, Gallium arsenides, Indium arsenides, Nanowires, Non linear effect, Optical properties, Quantum dots, Refractive index, Relaxation time, Spherical shape, Wave functions.

Abstract

In this study, the optical properties of an InAs spherical quantum dot placed at the center of a GaAs cylindrical nano-wire are investigated. The wave functions and the corresponding energy eigenvalues are numerically calculated in the framework of the effective mass approximation using the finite element method. The behavior of the linear, third-order nonlinear, the total optical absorption coefficients and optical refractive index changes are studied in detail, as a function of the incident photon energy for different geometric parameters, incident photon intensities and relaxation times by means of the compact density matrix approach. The results show that as the dot radius, nano-wire radius and nano-wire height increase both red- and blue-shifts appear. Moreover, the results also show that the relaxation time and the incident optical intensity have great influences on the absorption coefficient and refractive index changes.

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Le document en format XML

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<author><name sortKey="Safarpour, Gh" uniqKey="Safarpour G">Gh. Safarpour</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics, College of Sciences, Shiraz University</s1>
<s2>Shiraz 71454</s2>
<s3>IRN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
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<country>Iran</country>
<wicri:noRegion>Shiraz 71454</wicri:noRegion>
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<author><name sortKey="Barati, M" uniqKey="Barati M">M. Barati</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics, College of Sciences, Shiraz University</s1>
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<seriesStmt><idno type="ISSN">0022-2313</idno>
<title level="j" type="abbreviated">J. lumin.</title>
<title level="j" type="main">Journal of luminescence</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption coefficients</term>
<term>Absorption spectra</term>
<term>Effective mass model</term>
<term>Eigenvalues</term>
<term>Finite element method</term>
<term>Gallium arsenides</term>
<term>Indium arsenides</term>
<term>Nanowires</term>
<term>Non linear effect</term>
<term>Optical properties</term>
<term>Quantum dots</term>
<term>Refractive index</term>
<term>Relaxation time</term>
<term>Spherical shape</term>
<term>Wave functions</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Spectre absorption</term>
<term>Coefficient absorption</term>
<term>Indice réfraction</term>
<term>Propriété optique</term>
<term>Forme sphérique</term>
<term>Fonction onde</term>
<term>Point quantique</term>
<term>Nanofil</term>
<term>Arséniure d'indium</term>
<term>Arséniure de gallium</term>
<term>Valeur propre</term>
<term>Modèle masse effective</term>
<term>Méthode élément fini</term>
<term>Effet non linéaire</term>
<term>Temps relaxation</term>
<term>7820C</term>
<term>InAs</term>
<term>GaAs</term>
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<front><div type="abstract" xml:lang="en">In this study, the optical properties of an InAs spherical quantum dot placed at the center of a GaAs cylindrical nano-wire are investigated. The wave functions and the corresponding energy eigenvalues are numerically calculated in the framework of the effective mass approximation using the finite element method. The behavior of the linear, third-order nonlinear, the total optical absorption coefficients and optical refractive index changes are studied in detail, as a function of the incident photon energy for different geometric parameters, incident photon intensities and relaxation times by means of the compact density matrix approach. The results show that as the dot radius, nano-wire radius and nano-wire height increase both red- and blue-shifts appear. Moreover, the results also show that the relaxation time and the incident optical intensity have great influences on the absorption coefficient and refractive index changes.</div>
</front>
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<fA08 i1="01" i2="1" l="ENG"><s1>The optical absorption coefficient and refractive index changes of aspherical quantum dot placed at the center of a cylindrical nano-wire</s1>
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<fA11 i1="01" i2="1"><s1>SAFARPOUR (Gh.)</s1>
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<fA11 i1="02" i2="1"><s1>BARATI (M.)</s1>
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<fA14 i1="01"><s1>Department of Physics, College of Sciences, Shiraz University</s1>
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<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
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<fC01 i1="01" l="ENG"><s0>In this study, the optical properties of an InAs spherical quantum dot placed at the center of a GaAs cylindrical nano-wire are investigated. The wave functions and the corresponding energy eigenvalues are numerically calculated in the framework of the effective mass approximation using the finite element method. The behavior of the linear, third-order nonlinear, the total optical absorption coefficients and optical refractive index changes are studied in detail, as a function of the incident photon energy for different geometric parameters, incident photon intensities and relaxation times by means of the compact density matrix approach. The results show that as the dot radius, nano-wire radius and nano-wire height increase both red- and blue-shifts appear. Moreover, the results also show that the relaxation time and the incident optical intensity have great influences on the absorption coefficient and refractive index changes.</s0>
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<fC03 i1="01" i2="3" l="FRE"><s0>Spectre absorption</s0>
<s5>41</s5>
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<fC03 i1="01" i2="3" l="ENG"><s0>Absorption spectra</s0>
<s5>41</s5>
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<s5>42</s5>
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<fC03 i1="02" i2="3" l="ENG"><s0>Absorption coefficients</s0>
<s5>42</s5>
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<fC03 i1="03" i2="3" l="FRE"><s0>Indice réfraction</s0>
<s5>43</s5>
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<fC03 i1="03" i2="3" l="ENG"><s0>Refractive index</s0>
<s5>43</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE"><s0>Propriété optique</s0>
<s5>44</s5>
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<fC03 i1="04" i2="3" l="ENG"><s0>Optical properties</s0>
<s5>44</s5>
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<fC03 i1="05" i2="X" l="FRE"><s0>Forme sphérique</s0>
<s5>45</s5>
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<fC03 i1="05" i2="X" l="ENG"><s0>Spherical shape</s0>
<s5>45</s5>
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<fC03 i1="05" i2="X" l="SPA"><s0>Forma esférica</s0>
<s5>45</s5>
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<s5>46</s5>
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<s5>46</s5>
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<s5>61</s5>
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<s5>62</s5>
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<s5>62</s5>
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<s2>NK</s2>
<s5>63</s5>
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<fC03 i1="09" i2="3" l="ENG"><s0>Indium arsenides</s0>
<s2>NK</s2>
<s5>63</s5>
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<fC03 i1="10" i2="3" l="FRE"><s0>Arséniure de gallium</s0>
<s2>NK</s2>
<s5>64</s5>
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<fC03 i1="10" i2="3" l="ENG"><s0>Gallium arsenides</s0>
<s2>NK</s2>
<s5>64</s5>
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<fC03 i1="11" i2="3" l="FRE"><s0>Valeur propre</s0>
<s5>65</s5>
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<fC03 i1="11" i2="3" l="ENG"><s0>Eigenvalues</s0>
<s5>65</s5>
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<fC03 i1="12" i2="X" l="FRE"><s0>Modèle masse effective</s0>
<s5>66</s5>
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<fC03 i1="12" i2="X" l="ENG"><s0>Effective mass model</s0>
<s5>66</s5>
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<fC03 i1="12" i2="X" l="SPA"><s0>Modelo masa efectiva</s0>
<s5>66</s5>
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<fC03 i1="13" i2="3" l="FRE"><s0>Méthode élément fini</s0>
<s5>67</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Finite element method</s0>
<s5>67</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Effet non linéaire</s0>
<s5>68</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Non linear effect</s0>
<s5>68</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Efecto no lineal</s0>
<s5>68</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE"><s0>Temps relaxation</s0>
<s5>69</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG"><s0>Relaxation time</s0>
<s5>69</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>7820C</s0>
<s4>INC</s4>
<s5>83</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>InAs</s0>
<s4>INC</s4>
<s5>84</s5>
</fC03>
<fC03 i1="18" i2="3" l="FRE"><s0>GaAs</s0>
<s4>INC</s4>
<s5>85</s5>
</fC03>
<fN21><s1>224</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
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The optical absorption coefficient and refractive index changes of aspherical quantum dot placed at the center of a cylindrical nano-wire

The optical absorption coefficient and refractive index changes of aspherical quantum dot placed at the center of a cylindrical nano-wire

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English descriptors

Abstract

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