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- W2184319291 abstract "2. Abstract - Photonic-crystal (PhC) modulators using micro electra-mechanical system (MEMS) are proposed. MEMS controls the distance of a semiconductor platefrom the PhC and modulates propagating light through the evanescent interaction. Feasibility is demonstrated numerically and experimentally. Photonic crystals (PhCs) are now receiving much attention due to their. potential applications, especially to optical integrated circuits with extremely small size. Several functional devices (e.g. optical modulators) are required in these circuits. So far, the change in refractive index of constituent material through such as the electro-optic and nonlinear optical effects is used to control light (see, for instance, ref. 1 and 2). In this paper, we propose and demonstrate another approach to realize functional PhC devices utilizing the evanescent interaction, whose strength is controlled by MEMS. An example of our proposed device is illustrated .in Fig. I(a). Device consists of a line-defect waveguide in a PhC slab (e. g. SO1 (Silicon On Insulator) PhC slab) and a semiconductor plate located near the PhC. The guided lightwave interacts with the plate through the evanescent field. This interaction strongly depends on d. Thus, a MEMS actuator can modulate the transmitted intensity and phase of the output light by changing d. Here, we concentrate the modulation of propagating light. However, this scheme is also effective to control optical modes localized in point defects. Numerical calculations using three dimensional finite difference time domain method prove that proposed devices show relatively good performance as optical modulators. We have also demonstrated the modulation due to the evanescent interaction in experiments. We used a thick GaAs plate and a line-defect SO1 PhC waveguide (SOI=20Onm, BOX=bOOnm, a=450nm, ~150nm). The used GaAs plate has the thickness of 60 pm and the length along.the propagation direction of 120 pm. The plate was set to be above the PhC waveguide. Then, the transmitted power (h=1.55wm) was measured by changing the distance d. The distance d was controlled by using a piezo actuator. Figure I@) shows the transmitted power for a SO-pm long PhC waveguide as a fimction of d. Reduction in transmittance with a decrease of d was observed. The maximum modulation contrast of -IO& was obtained. For a 100-am long PhC waveguide, similar result was obtained. For" @default.
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- W2184319291 date "2002-01-01" @default.
- W2184319291 modified "2023-09-27" @default.
- W2184319291 title "THZC-(I 6)-3 PHOTONIC CRYSTAL MODULATORS CONTROLLED BY MICRO ELCTRO-MECHANICAL SYSTEMS -PROPOSAL AND EXPERIMENTS-" @default.
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