<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2018000300254</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of GaN substrate thickness on the optical field of InGaN laser diodes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martín]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciego de ávila &#8220;Máximo Gómez Báez&#8221; Facultad de Informática y Ciencias Exactas ]]></institution>
<addr-line><![CDATA[Ciego de ávila ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de La Habana Facultad de Física ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>64</volume>
<numero>3</numero>
<fpage>254</fpage>
<lpage>260</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2018000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2018000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2018000300254&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work the influence of GaN substrate thickness on the near and far-field patterns of InGaN lasers structures is numerically studied. In simulation a typical structure with an InGaN-MQW active region, GaN waveguide and AlxGa1&#8722;xN cladding layers is considered. A fluctuating behavior was obtained showing that for some values of the substrate thickness the near and far-field patterns can be optimized, while there are critical values that significantly reduce the confinement factor and widen the far field patterns. It is also shown that, replacing the n-GaN contact layer by a graded index (GRIN) AlxGa1&#8722;xN layer can help reduce the optical field leakage to substrate. Simulation results indicate that properly choosing the thickness of the substrate and using a GRIN n-AlxGa1&#8722;xN contact layer it is possible to improve both the confinement factor and far field patterns in nitride lasers.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Optical field leakage]]></kwd>
<kwd lng="en"><![CDATA[numerical simulation]]></kwd>
<kwd lng="en"><![CDATA[InGaN laser diodes]]></kwd>
<kwd lng="en"><![CDATA[GaN substrates]]></kwd>
</kwd-group>
</article-meta>
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