We show that a linear relation exists between the device sensitivity and the quality （Q） factor of a dual- waveguide coupled microring resonator optical biosensor when the optimal conditions are satisfied. We also s...
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We show that a linear relation exists between the device sensitivity and the quality （Q） factor of a dual- waveguide coupled microring resonator optical biosensor when the optimal conditions are satisfied. We also show that the detection limit depends on the loss coefficient and signal-to-nosie ratio （SNR） of the overall system, rather than the circumference of the ring. For a microring resonator sensor whose Q factor is 20000, the detection limit is found to be about 10-7 with 30-dB SNR, which is in good agreement with reported experimental data. These results indicate that loss reduction is the top priority in the design and fabrication of highly sensitive microring resonator optical biosensors.
Partial bandgap characteristics of parallelogram lattice photonic crystals are proposed to suppress the radiation modes in a compact dielectric waveguide taper so as to obtain high transmittance in a large wavelength ...
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Partial bandgap characteristics of parallelogram lattice photonic crystals are proposed to suppress the radiation modes in a compact dielectric waveguide taper so as to obtain high transmittance in a large wavelength range. Band structure of the photonic crystals shows that there exists a partial bandgap, The photonie crystals with partial bandgap are then used as the cladding of a waveguide taper to reduce the radiation loss efficiently. In comparison with the conventional dielectric taper and the complete bandgap photonic crystal taper, the partial bandgap photonic crystal taper has a high transmittance of above 85% with a wide band of 170 nm.
The wide field-of-view(FOV) optical receiver has many advantages in optical wireless communication,sensing and ***,the FOV is limited by some tradeoffs of the receiver's components employing conventional optical *...
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The wide field-of-view(FOV) optical receiver has many advantages in optical wireless communication,sensing and ***,the FOV is limited by some tradeoffs of the receiver's components employing conventional optical ***,present mechanisms to extend the FOV are not *** realize the wide FOV receiver effectively,we propose surface plasmon polaritons(SPPs) as the potential *** examples are presented to lively illustrate SPPs' striking power to offer unexpected solutions to conventional *** is shown that unusual conditions should be explored to make use of SPPs under some *** of localized SPPs,which are independent of the incidence angle,are suggested as the mechanism for the wide FOV *** progress in the optimization of SPPs' excitation at oblique incidence is also reported.
A slotted single-mode photonic crystal waveguide with a linear tapered slot is presented to realize slow light,whose dispersion curve is shifted by changing the slot *** the slot width is reduced,the band curve shifts...
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A slotted single-mode photonic crystal waveguide with a linear tapered slot is presented to realize slow light,whose dispersion curve is shifted by changing the slot *** the slot width is reduced,the band curve shifts in the tapered structure,and the group velocity of light approach zero at the cut-off ***,different frequency components of the guided light are slowed down even localized along the propagation direction inside a tapered slot photonic crystal ***,this structure can confine slow light-wave in a narrow slot waveguide,which may effectively enhance the interaction between slow light and the low-index wave-guiding materials filled in the *** addition,this tapered slot structure can be used to compensate group velocity dispersion of slow light by modifying the structure,thus opening the opportunity for ultra-wide bandwidth slow light.
Periodic structures have been used extensively in optics and photonics. This paper is to report our work on manipulating optical propagation in the nanophotonics domain using silicon devices based on periodic structures.
Periodic structures have been used extensively in optics and photonics. This paper is to report our work on manipulating optical propagation in the nanophotonics domain using silicon devices based on periodic structures.
A novel microring resonator accelerometer is proposed. It is realized by a suspended straight waveguide coupled with a microring resonator. Under the external acceleration, the coupling coefficient is a function of ga...
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A novel microring resonator accelerometer is proposed. It is realized by a suspended straight waveguide coupled with a microring resonator. Under the external acceleration, the coupling coefficient is a function of gap spacing between the two waveguides. The mathematical model of the sensing element is established. Both the finite element method and coupled mode theory are adopted to analyze and optimize the proposed structure. Simulation results show that the mechanical sensitivity is 0.015 μm/g with the working frequency below 500 Hz and cross-axis sensitivity less than 0.001%, which is promising in seismic related applications.
This paper addresses the problem of optimal rate allocation for video stream in peer-to-peer networks. We present a distributed rate allocation algorithm with the goal of minimizing the total video distortion among pe...
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Layered streaming is an effective solution to address receiver heterogeneity in a Peer-to-peer (P2P) network. This paper addresses the problem of rate allocation for layered video stream in p2p mesh networks. We prese...
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This paper analyzes the non-persistent Carrier Sense Multiple Access (CSMA) mechanism, and simulates its application in IEEE 802.15.4. We find that throughputs are relevant to the normalized propagation delay and the ...
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