Figure 4.

The cavity refractive indices versus relative channel spacings and continuous tuning of the edge channels. ( a) The cavity refractive indices <a onClick="popup('http://www.nanoscalereslett.com/content/7/1/387/mathml/M27','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/387/mathml/M27">View MathML</a> versus the ratio of the channel spacings, λs12/λs23. (b) Continuous blue shift of the edge channels with a linear decrease in the central cavity refractive index, <a onClick="popup('http://www.nanoscalereslett.com/content/7/1/387/mathml/M28','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/387/mathml/M28">View MathML</a> by ∆n = 0.02 (thin black line), ∆n = 0.052 (dashed blue line) and ∆n = 0.11 (dashed dotted blue line). The triple transmission channels, for ∆n = 0, are also demonstrated (thick black line). ( c) Continuous red shift of the edge transmission channels with a linear increase in the central cavity refractive index, <a onClick="popup('http://www.nanoscalereslett.com/content/7/1/387/mathml/M29','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/7/1/387/mathml/M29">View MathML</a> by ∆n = 0.02 (thin black line), ∆n = 0.052 (red dashed line) and ∆n = 0.11 (red dashed dotted line).

Baldycheva et al. Nanoscale Research Letters 2012 7:387   doi:10.1186/1556-276X-7-387
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