Micro-nano optomechanical accelerometers are widely used in automobile, aerospace, and other industrial applications. Here, we fabricate mechanical sensing components based on an electrically pumped GaN light-emitting diode (LED) with a beam structure. The relationship between the blueshift of the electroluminescence (EL) spectra and the deformation of the GaN beam structure based on the quantum-confined Stark effect (QCSE) of the InGaN quantum well (QW) structure is studied by introducing an extra mass block. Under the equivalent acceleration condition, in addition to the elastic deformation of GaN-LED, a direct relationship exists between the LED’s spectral shift and the acceleration’s magnitude. The extra mass block (gravitational force: ) induced blueshift of the EL spectra is obtained and shows driven current dependency. A polymer sphere (PS; gravitational force: ) is placed at the center of the beam GaN-LED, and a blueshift of 0.061 nm is observed in the EL spectrum under the injection current of 0.5 mA. The maximum sensitivity of the acceleration is measured to be , and the maximum measurable acceleration is calculated to be . It indicates the simultaneous realization of high sensitivity and a broad acceleration measurement range. This work is significant for several applications, including light force measurement and inertial navigation systems with high integration ability.
2023, 11(9): 1583
针对五步相移干涉测量，提出了一种新的质量图用于引导路径预测区域增长算法。首先基于分支设置处理残差点，直至相位图中所有残差点都被平衡。然后将包裹相位图按质量值分割为若干区域，把分支对应的质量值设为最低，按质量值由高到低顺序对每一区域的相位进行路径预测区域增长方式的去包裹，若区域间有交界，则通过调整偏移量的方法进行融合处理。软件仿真和实验验证结果表明，与传统区域增长算法相比，新算法准确度更高，计算速度更快。区域增长 相位去包裹 质量图 五步相移 region-growing phase unwrapping quality-guided map five step phase shift
提出了一步变换三原子W态为三原子超单态的方案。在方案中，三个五能级原子同时与双模腔发生离散相互作用。方案的优点是可以有效抵御原子自发辐射和腔衰变引起的消相干的影响。超单态 W态 离散相互作用 supersinglet W state dispersive interaction