Experimental demonstration of a four-port photonic crystal cross-waveguide structure

Abstract

We report the design and fabrication of a four-port InP photonic crystal cavity-waveguide structure in which two crossing waveguides intersect in a cavity. Transmission measurements show that by exploiting mode-gap effects, high cross-talk suppression between the two waveguides can be obtained. In addition, the waveguides couple to two distinct cavity resonances with different quality-factors as well as small mode volumes. This structure is promising for realizing ultra-fast, low-energy optical switches or memories.

Active photonic crystal switches: Modeling, design and experimental characterization

“…The different hole shifts near the waveguides result in a frequency separation between the guided waveguide modes, and by adjusting the hole shifts near the cavity as described in Ref. [12], the resonance frequencies of the even and odd cavity modes (see the right panel in Fig. 1) may be located as shown in the band diagram.…”

Wavelength Conversion of a 9.35-Gb/s RZ OOK Signal in an InP Photonic Crystal Nanocavity

“…The coupling loss between lensed single mode fibers and the waveguide is estimated to be about 7.5 dB per facet. The detailed fabrication process is described in [4]. Fig.…”

Fano resonance control in a photonic crystal structure and its application to ultrafast switching

“…Devices were fabricated using a process described elsewhere 35 . The PhC structure with triangular lattice was first patterned into a 500 nm positive resist (11% ZEP520A) by electron-beam lithography and then transferred to a 200 nm PECVD SiN x hard mask by CHF 3 /O 2 reactive-ion etching.…”

“…Other improvements are possible, e.g. the combination with multi-mode 7,34 and multi-port 35 designs to relieve the pump-signal crosstalk limitation as well as employing quaternary InGaAsP material, where carriers are generated through a combination of two-photon and linear absorption 4 , significantly reducing the energy consumption. Considering that the device properties are governed by a quite general coupled mode formalism, we believe that the investigated Fano resonances can be realized using a wide range of structures such as micro-disk or micro-ring resonators 32 .…”