Journal: Nano-Micro Letters

Article Title: An Ultrasonic Microrobot Enabling Ultrafast Bidirectional Navigation in Confined Tubular Environments

doi: 10.1007/s40820-025-01894-y

Figure Lengend Snippet: Motion mechanism and performance characterization of the ultrasonic microrobot. a The left image illustrates the actuation mechanism of the PZT thin film, where the film elongates by ∆L under positive voltage and contracts by ∆L under negative voltage. The right image depicts the corresponding actuation behavior of the microrobot when driven by a sinusoidal signal at ultrasonic frequency. b Comparison between the simulated and experimentally measured impedance characteristics of the microrobot. c Vibration test results were obtained using a laser Doppler vibrometer, showing the vibration velocity response spectrum as a function of frequency and the vibration mode at maximum vibration velocity. d Relationship between the movement speed of the microrobot and the driving signal frequency, with the shaded portion representing backward movement. e Fine-tuned test results of the maximum moving speed of the microrobot versus the driving signal frequency. f Relationship between the movement speed of the microrobot and the voltage amplitude of the driving signal. All error bars represent the standard deviation of three times of measurements. g Mechanistic analysis of the microrobot during forward motion, showing the simulated forward motion mode and the characteristic frequency of 59.821 kHz. The simplified diagram below illustrates that the nodes form counterclockwise elliptical trajectories with the contact surface. h Mechanistic analysis of the microrobot during backward motion, showing the simulated backward motion mode and the characteristic frequency of 47.268 kHz. The simplified diagram below illustrates that the nodes form clockwise elliptical trajectories with the contact surface

Article Snippet: The vibration velocity response spectrum at various frequencies, as well as the vibration mode at the resonant frequency, was measured using a Doppler laser vibrometer (PSV-500, Polytec GmbH, Germany).

Techniques: Comparison, Standard Deviation

Journal: Npj Quantum Information

Article Title: Check-probe spectroscopy of lifetime-limited emitters in bulk-grown silicon carbide

doi: 10.1038/s41534-025-00985-3

Figure Lengend Snippet: a Experimental sequence. A short (10 μ s, 10 μ W) high-energy (785 nm) repump laser pulse (‘R’) partially scrambles the charge state of both the environment and the V2 centre. Emission is collected during the ‘check’ block, when two NIR lasers at frequencies f and f 2 are turned on (approximately resonant with the broad peak in Fig. g). b We observe an increase in count rate if the laser frequency difference is equal to Δ = 954(2) MHz, the spacing between the A and A 2 transitions. A Lorentzian fit obtains an FWHM of 89(9) MHz. c Detected mean count rate per experimental repetition, when the length of the ‘check’ block is set to 5 ms. In most repetitions, the defect is off-resonant with the lasers. When the A and A 2 transitions coincide with laser frequencies f and f 2 , we observe significant emission (≫1 kHz). Thresholding (dashed line) on the detected counts can be employed to prepare specific (i.e. ‘on resonance’) spectral configurations of the V2 centre.

Article Snippet: The NIR lasers (Toptica DL Pro and the Spectra-Physics Velocity TLB-6718-P) are frequency-locked to a wavemeter (HF-Angstrom WS/U-10U) and their power is modulated by acousto-optic-modulators (G&H SF05958).

Techniques: Sequencing, Blocking Assay

Journal: Npj Quantum Information

Article Title: Check-probe spectroscopy of lifetime-limited emitters in bulk-grown silicon carbide

doi: 10.1038/s41534-025-00985-3

Figure Lengend Snippet: a Experimental sequence. A ‘check’ block (2 ms, 20 nW) is followed by a system perturbation (marked ‘X’), which here consists either of turning off the lasers ( c ), turning on the NIR lasers ( d ), or turning on the repump laser ( e ). A second block (2 ms, 20 nW) probes whether the defect has diffused away, or has ionised (denoted ‘probe’). Data is post-selected by imposing a minimum-counts threshold ( T ), heralding the emitter on resonance in the first (second) block and computing the mean number of counts in the second (first) block, which encodes the emitter brightness at future (past) delay times t . b Schematic illustrating the expected signal (according to Eq. ), when either ionisation or spectral diffusion is dominant (setting γ r ≈ 0). c No significant spectral diffusion or ionisation is observed when the lasers are turned off. The solid line is a fit to the data using Eq. . Dashed grey line denotes the set threshold (in a 2 ms window). d Experiment and fit under 20 nW of NIR laser power (916 nm). e Experiment and fit under 1 μ W of repump laser power. f Extracted saturation-diffusion rates, obtained at laser powers of ~20 nW (resonant) and ~5 μ W (repump). See supplementary Fig. for underlying data and error analysis.

Article Snippet: The NIR lasers (Toptica DL Pro and the Spectra-Physics Velocity TLB-6718-P) are frequency-locked to a wavemeter (HF-Angstrom WS/U-10U) and their power is modulated by acousto-optic-modulators (G&H SF05958).

Techniques: Sequencing, Blocking Assay, Diffusion-based Assay