Haodong Qiu

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In this paper, we present our recent results on the development of passive devices for short-wave infrared and MIR applications. SOI platform is used and several devices, like waveguides, MMIs, spirals, unbalanced MZI, are designed, fabricated and characterized at the wavelengths of 2μm and 3.8μm.
A fabrication-tolerant mid-infrared silicon polarization splitter and rotator (PSR) based on a partially etched grating-assisted coupler is proposed. The design of the partially etched structure allows to use different cladding layers, such as SiO2, to make the device compatible with the metal back-end of line process. Moreover, by using the(More)
A compact and ultrabroadband polarization beam splitter (PBS) utilizing a hybrid plasmonic Y-branch (HPYB) on a silicon-on-insulator (SOI) platform is proposed and numerically demonstrated. The HPYB consists of a vertical hybrid plasmonic waveguide (HPW) and a horizontal HPW formed by silicon (Si) and silver (Ag) strip waveguides sandwiched with a silicon(More)
The metal contact is one of the most crucial parts in ohmic-contact microelectromechanical (MEMS) switches, as it determines the device performance and reliability. It has been observed that there is contact instability when the contact force is below a threshold value (minimum contact force). However, there has been very limited knowledge so far about the(More)
In this letter, we report an InAlN/GaN high electron mobility transistor (HEMT) with a planar nanostrip channel design to improve its transconductance <inline-formula> <tex-math notation="LaTeX">$\text{g}_{\mathrm {\mathbf {\textsf {m}}}}$ </tex-math></inline-formula> and cut-off frequency <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathbf(More)
An all-pass microring-Bragg gratings (APMR-BG) based coupling resonant system is proposed and experimentally demonstrated to generate electromagnetically induced transparency (EIT)-like transmission for the first time. The coupling between two light path ways in the micro-ring resonator and the Fabry-Pérot (F-P) resonator formed by two sections of Bragg(More)
In nowadays, ohmic-contact MEMS switches have been widely studied due to their variously advantages, such as high isolation, low insertion loss, negligible power consumption and so on. The micro-contact behavior has been analyzed by several researchers using the conventional asperity deformation model, in which the electrical contact resistance decreases(More)
Compact all-pass and add-drop microring resonators (radius=10  μm) integrated with grating couplers working at 2 μm wavelength are designed, fabricated, and characterized on a commercial 340-nm-thick-top-silicon silicon-on-insulator platform. They are suitable for high-volume integrated optical circuits at 2 μm wavelength as the fabrication process involved(More)
A microring-Bragg grating based coupling resonant system is experimentally demonstrated to generate switchable EIT-like and Fano transmissions for the first time. The resonance state is dependent on the relation between coupling coefficient and round-trip-intensity-attenuation.
Engineering the surrounding electromagnetic environment of light emitters by photonic engineering, e.g. photonic crystal cavity, can dramatically enhance its spontaneous emission rate through the Purcell effect. Here we report an enhanced spontaneous emission rate of monolayer molybdenum disulfide (MoS2) by coupling it to a 1D silicon nitride photonic(More)