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Mode-locked integrated mid-IR waveguide chip lasers with ultra-short pulse duration and high peak power are of great interest for a large range of applications like trace-gas spectroscopy and early-cancer detection. As those lasers are automatically embedded within a small block of doped glass, they are inherently robust and immune to environmental fluctuations. In this paper we investigate the suitability...
We propose a plasmonic refractive index-sensitive nanosensor based on the electromagnetically induced transparency (EIT) of waveguide resonator systems. The structure consists of one tooth-shaped cavity as well as the bus and stub metal-insulator-metal waveguides. By adjusting the structural geometry, it is demonstrated that the controllable transmission of EIT response can be obtained with the finite-difference-time-domain...
We develop the temporal coupled mode theory for the ring-bus-ring device by taking account of the energy-conservation. The presence of the center waveguide in the tri-coupler section of the RBR facilitates the interaction between the two side-coupled rings. The correspondence between the coupled mode theory in time and transfer matrix formalism (TMF) is established. A very good agreement is obtained...
In this paper, we present the theoretical study of ring-bus-ring coupled into Mach-Zehnder interferometer (RBR-MZI) device, which is capable of generating transparent window analogy to the electromagnetically induced transparency (EIT) phenomenon in atomic system. The RBR is a new class of two-resonator system, where the inter-cavity interaction is facilitated by a tri-coupler, instead of conventional...
A silicon waveguide based splitter is a key device for polarization diversity circuit. A bilayer waveguide structure was proposed by MIT to split the input light into its orthogonal components. It is challenging to fabricate a bilayer silicon waveguide by the conventional two-step-etching process due to precise alignment and accurate etch thickness required. In addition, the partial etched waveguide...
In this paper, we will focus on CCW waveguides, which building block consists of a photonic crystal cavity of a moderate Q-factor, i.e., Q~103. We will show that despite increased radiation loss that cannot be avoided in the present design, a chain of more than 50 cavities can be coupled, as confirmed by both transmission experiment and near-field imaging. Moreover, formation of a smooth and continuous...
In this work, we explore a broad range of exposure conditions, including two rarely studied parameters of polarization and pulse duration, to minimize propagation loss and to better understand the differing formation mechanisms in borosilicate and fused silica glass waveguides.
Two extreme contrasts in ultrafast laser writing of optical waveguides are explored: heat accumulation effects at high (~1-MHz) repetition rate for generating smooth waveguides and periodic Bragg-grating waveguides generated with 1-kHz rate lasers
A femtosecond fiber laser with 1-MHz repetition rate was optimized to write low-loss waveguides and directional couplers inside bulk borosilicate glass. For the first time, this three-dimensional writing method has produced low insertion loss and near-unity maximum coupling ratio. Results are presented at telecommunication wavelengths of 1310 and 1550 nm
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