Description:
<jats:title>Abstract</jats:title>
<jats:p>We present a computational study of Purcell factor enhancement for a novel hybrid-plasmonic ring resonator using a novel implementation of the body-of-revolution (BOR) finite-difference time-domain (FDTD) method. In this hybrid structure, a dielectric slot ring is surrounded by a metallic ring such that a hybrid plasmonic mode is generated within two thin low-index gaps. The surrounding metallic ring decreases the binding loss for small ring radii, leading to high-quality factors and mode-field confinement. The hybrid resonator shows high quality-factor values above 10<jats:sup>3</jats:sup> and small mode volumes down to <jats:inline-formula>
<jats:tex-math>
<?CDATA ${10}^{-3}{\left(\tfrac{\lambda }{n}\right)}^{3}$?>
</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:msup>
<mml:mrow>
<mml:mn>10</mml:mn>
</mml:mrow>
<mml:mrow>
<mml:mo>−</mml:mo>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msup>
<mml:msup>
<mml:mrow>
<mml:mfenced close=")" open="(">
<mml:mrow>
<mml:mstyle displaystyle="false">
<mml:mfrac>
<mml:mrow>
<mml:mi>λ</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>n</mml:mi>
</mml:mrow>
</mml:mfrac>
</mml:mstyle>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mrow>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msup>
</mml:math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="psacff45ieqn1.gif" xlink:type="simple" />
</jats:inline-formula> simultaneously, thus providing large Purcell factors (<jats:italic>F</jats:italic>
<jats:sub>
<jats:italic>p</jats:italic>
</jats:sub> > 10<jats:sup>4</jats:sup>). The distributed strong confinement within two gaps renders the proposed resonator useful for multi-emitter applications.</jats:p>