Submicron-meter size GaAsBi disk resonators were fabricated with the GaAsBi/GaAs single-quantum-well(QW)-structure grown by molecular beam epitaxy. The GaAsBi/GaAs QW revealed very broad photoluminescence signals in t...
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Submicron-meter size GaAsBi disk resonators were fabricated with the GaAsBi/GaAs single-quantum-well(QW)-structure grown by molecular beam epitaxy. The GaAsBi/GaAs QW revealed very broad photoluminescence signals in the wavelength range of 1100–1400 nm at 300 K. The 750 nm diameter and 220 nm thick disk resonators were optically pumped and exhibited lasing characteristics with continuous wave operation at room *** our knowledge, it is the first demonstration of a lasing wavelength longer than 1.3 μm with a maximum value of 1.4 μm in a GaAsBi/GaAs material system. The lasing wavelength spans about 130 nm by adjusting the disk diameter, covering almost the entire O band. The ultrasmall GaAsBi disk lasers may have great potential for highly dense on-chip integration with large tunability in the O band.
One of the key requirements for MEMS speakers is to increase the sound pressure level(SPL)while keeping the size as small as *** this paper we present a MEMS speaker based on piezoelectric bimorph cantilevers that pro...
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One of the key requirements for MEMS speakers is to increase the sound pressure level(SPL)while keeping the size as small as *** this paper we present a MEMS speaker based on piezoelectric bimorph cantilevers that produces a higher SPL than conventional unimorph cantilever *** active diaphragm size is 1.4×1.4 mm^(2).The bimorph cantilevers are connected in parallel to make full use of the actuation *** 1 kHz,the measured SPL reached 73 dB and the peak SPL reached 102 dB at the resonance frequency of 10 kHz in a 711 ear simulator under a driving voltage of 10 V_(rms).The total harmonic distortion of the MEMS speaker was less than 3%in the range from 100 Hz to 20 *** the absolute SPL was not the highest,this work provides a better SPL for all piezoelectric MEMS speakers.
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