Novel Dispersion-Adapted Photonic Crystal Cavity With Improved Disorder Stability

Cascaded modulator architecture for WDM applications

“…Here we used the PhC cavity design introduced in [7] and realized a five channel WDM modulator circuit by cascading five PhC cavities that are designed to address successive wavelength channels. To create the pin junctions, five sets of doping windows were defined with "fingers" extending into the PhC regions, similar to [9], and doped using ion implantation of boron and phosphorous (~10 19 cm −3 ).…”

“…This provides compact devices with high Q-factors and enhanced light matter interaction. Many types of PhC cavities have already been reported that combine high Q-factor with ultra-low mode volume [5][6][7]. Due to the ultra-low mode volume, PhC cavities can be modulated with a power consumption of one to two orders of magnitude lower than conventional ring resonators.…”

Highly efficient optical filter based on vertically coupled photonic crystal cavity and bus waveguide

“…On the other hand, the design of PhC cavities with small mode number (i.e., single-mode operation) and ultrahigh quality factor is relatively mature [6,7]; nevertheless, due to their small size, efficient coupling of light in and out of the cavity is challenging, making the overall extinction ratio of such devices low. The conventional approach is to use a PhC line-defect waveguide side-coupled to a PhC cavity, but the line defect itself introduces additional Fourier components into the light cone of the cavity, which in turn reduces the overall extinction ratio [8].…”

“…In the case of PhC cavities, the K-space distribution is expanded due to their ultrasmall mode volume, helping achieve matching with the optical mode of a waveguide with dissimilar material. Figure 2 shows the real-space and K-space distribution of the waveguide mode and the first-order mode of the cavity used in this Letter (the design was introduced in [7]). Due to the rich K-space distribution of the cavity mode, a small change in the effective index of the waveguide can cause a dramatic change in the mode overlap and hence a large change in the transmittance of the whole system.…”

Wavelength-controlled external-cavity laser with a silicon photonic crystal resonant reflector

“…The figure 2 presents the normalized power detected by the spectrometer versus wavelength for a device under test consisting of a PhC cavity with a period lattice constant α=388 nm and radius to period ratio of r/α=0.28 nm [10]. The graph shows the results for both the passive resonance characterization using the broadband source (black continuous line), and for the output of the cavity laser configuration (dashed blue line).…”