High quality (Q approximately 6 x 10(5)) microdisk resonators are demonstrated in a Si(3)N(4) on SiO(2) platform at 652-660 nm with integrated in-plane wrap-around coupling waveguides to enable critical coupling to specific microdisk radial modes. Selective coupling to the first three radial modes with >20dB suppression of the other radial modes is achieved by controlling the wrap-around wavegu...

We characterize planar microcavities in whispering-gallery mode optical resonances. The microcavity consists of a waveguide and a microdisk, and a nanoscale gap separates the waveguide and the microdisk. The devices can be fabricated on Si-based thin films by using conventional microelectronics techniques. To characterize these types of cavity, we study a broad range of resonator configuration ...

Microdisk lasers, based on whispering gallery optical resonances, have recently attracted considerable attention. The interest in microdisk lasers is driven by, amongst other factors, their potential for low-threshold power, ease of fabrication and in-plane emission characteristics. However, there are a few key challenges that need to be overcome for these devices to become practical, chief amo...

We demonstrate unidirectional bistability in microdisk lasers electrically pumped and heterogeneously integrated on SOI. The lasers operate in continuous wave regime at room temperature and are single mode. Integrating a passive distributed Bragg reflector (DBR) on the waveguide to which the microdisk is coupled feeds laser emission back into the laser cavity. This introduces an extra unidirect...

Heterogeneous integration of InGaAsP microdisk lasers on a silicon platform is demonstrated experimentally using an optofluidic assembly technique. The 200-nm-thick, 5and 10-μm-diameter microdisk lasers are fabricated on InP and then released from the substrates. They are reassembled on a silicon platform using lateral-field optoelectronic tweezers (LOET). The assembled laser with 5-μm diameter...

Room-temperature small-signal intensity-modulation frequency response of InGaAs/InGaAsP multiple quantum well microdisk lasers depends on disk radius. For frequencies up to 2 GHz the measured response of a small radius microdisk laser is closer to an ideal laser compared to larger devices. The dynamic response of larger radius lasers is strongly in¯uenced by the presence of a reservoir of carri...

Strong couplings between cavity modes in photonic molecules formed by two preselected nearly identical microdisk microcavities with embedded quantum dots are investigated. By continuously tuning the refractive index of one microdisk, clear anticrossings in the resonant peak energies associated with crossings in the peak linewidths can be observed. The coupling strengths are extracted by the cou...

A self-homodyne photonic receiver for transmitted carrier wireless links isdemonstrated. The key innovations in this photonic RF-receiver are the design andimplementation of a resonant LiNbO3 microdisk electro-optic modulator and novelRF down-conversion techniques that exploit the sensitivity of the microdisk forefficient RF down-conversion in the optical domain. By careful RF a...

We present germanium microdisk optical resonators under a large biaxial tensile strain using a CMOS-compatible fabrication process. Biaxial tensile strain of ~0.7% is achieved by means of a stress concentration technique that allows the strain level to be customized by carefully selecting certain lithographic dimensions. The partial strain relaxation at the edges of a patterned germanium microd...

Monochromaticity and directionality are two key characteristics of lasers. However, the combination of directional emission and single-mode operation is quite challenging, especially for the on-chip devices. Here we propose a microdisk laser with single-mode operation and directional emissions by exploiting the recent developments associated with parity-time (PT) symmetry. This is accomplished ...