Topic
Optical microcavity
About: Optical microcavity is a research topic. Over the lifetime, 2599 publications have been published within this topic receiving 72125 citations. The topic is also known as: optical microcavities.
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TL;DR: In this article, the optimal structure of the membrane laser in terms of its energy cost was investigated for on-chip optical interconnections, and the total power consumption was evaluated, taking Joule heating into account by assuming the device resistance.
Abstract: The power consumption of lateral-current-injection semiconductor membrane distributed-reflector lasers with a λ/4 shift region has been theoretically evaluated, in terms of their ultralow-power-consumption and high-speed modulation operations. This paper contains an investigation into the optimal structure of the membrane laser in terms of its energy cost, for use in on-chip optical interconnections. The total power consumption was evaluated, taking Joule heating into account by assuming the device resistance. It was found that the large Joule heating effect present in shorter cavities limits a reduction of their power consumption. As a result, an energy cost of 63 fJ/bit can be obtained for 10 Gb/s data transmission, while maintaining the necessary power output required for a cavity length of 12 μm. We have provided a guide for designing microcavity lasers in terms of their Joule heating power.
16 citations
TL;DR: Polaritons as mentioned in this paper are states that inherit characteristics of both the optical cavity modes and the optical microcavity modes and can be formed by strong coupling of molecules placed in an optical micro cavity may lead to the formation of hybrid states called polaritons.
Abstract: Strong coupling of molecules placed in an optical microcavity may lead to the formation of hybrid states called polaritons; states that inherit characteristics of both the optical cavity modes and ...
16 citations
TL;DR: In this article, a small-signal cross-gain modulation of quantum dot based semiconductor optical amplifiers (QD SOAs), having a dot-in-a-well structure, is presented, demonstrating superiority for ultrahigh bit rate wavelength conversion.
Abstract: Small-signal cross-gain modulation of quantum dot based semiconductor optical amplifiers (QD SOAs), having a dot-in-a-well structure, is presented, demonstrating superiority for ultrahigh bit rate wavelength conversion. Optimization of the QD SOA high speed characteristics via bias current and optical pump power is presented and a small-signal 3 dB bandwidth exceeding 40 GHz is demonstrated. The p-doped samples investigated here enable small-signal wavelength conversion within a range of 30 nm, limited mainly by the gain bandwidth.
16 citations
01 Jul 2017-Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology
TL;DR: In this article, a tool with a nose radius of 0.01mm was used for cylindrical turning of a single-crystal calcium fluoride (CaF2) microcavity.
Abstract: An optical microcavity, which stores light at a certain spot, is an essential component to realize all-optical signal processing. Single-crystal calcium fluoride (CaF2) theoretically shows a high Q-factor which is a desirable optical property. The CaF2 microcavity can only be manufactured by ultra-precision cylindrical turning (UPCT). The authors have studied UPCT of CaF2 and shown the influence of crystal anisotropy and tool geometry on surface roughness and subsurface damage. The study indicated that a smaller nose radius of the cutting tool led to shallower subsurface damage. Thus, it is inferred that a smaller nose radius compared to the previous nose radius (0.05 mm) can further reduce subsurface damage. Nevertheless, the mechanism that causes a difference in subsurface damage due to crystal anisotropy is not sufficiently clear. The influence of subsurface damage on microcavity performance is still unclear. In this study, the UPCT of CaF2 was conducted using a tool with a nose radius of 0.01 mm. The subsurface damage was investigated by transmission electron microscope (TEM) observation from the viewpoint of the change in crystal lattice arrangement. In our previous study, fast Fourier transfer (FFT) analysis was used for confirmation of change of crystal structure. In this study, FFT analysis was also used to quantitatively evaluate the depth of subsurface damage. In addition, inverse fast Fourier transfer (IFFT) was used to analyze change of crystal lattice arrangement clearly, which enables discussion of the influence of slip systems. Finally, optical microcavities are manufactured without any crack, and the influence of subsurface damage on microcavity performance is experimentally evaluated using a wavelength tunable laser and power meter.
16 citations
TL;DR: In this article, a high-resolution optical technique was developed to measure the electromechanical properties of MEMS microstructures, which is applied to microbridges developed for capacitive switching in coplanar radio frequency (RF) waveguides.
Abstract: We have developed a high resolution optical technique to measure the electromechanical properties of MEMS microstructures. The technique is applied to microbridges developed for capacitive switching in coplanar radio frequency (RF) waveguides. The thin metal ground plane on the substrate and the bottom of the bridge together form a microcavity for an optical beam. The wavelength of a cavity mode is a sensitive measure of the bridge position relative to the substrate. The technique is applied to the measurement of resonances and damping times of microbridges of varying lengths. It is also used to measure dc changes in bridge height of tenths of nanometers, driven ac displacements of less than a picometer, and bridge displacement noise of hundreds of femtometers per root Hertz. This extreme sensitivity exceeds previously demonstrated optical characterization methods.
16 citations