On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

Abstract

Bessel beam featured with self-healing is essential to the optical sensing applications in the obstacle scattering environment. Integrated on-chip generation of the Bessel beam outperforms the conventional structure by small size, robustness, and alignment-free scheme. However, the maximum propagation distance (Zmax) provided by the existing approaches cannot support long-range sensing, and thus, it restricts its potential applications. In this work, we propose an integrated silicon photonic chip with unique structures featured with concentrically distributed grating arrays to generate the Bessel–Gaussian beam with a long propagation distance. The spot with the Bessel function profile is measured at 10.24 m without optical lenses, and the photonic chip’s operation wavelength can be continuously performed from 1500 to 1630 nm. To demonstrate the functionality of the generated Bessel–Gaussian beam, we also experimentally measure the rotation speeds of a spinning object via the rotational Doppler Effect and the distance through the phase laser ranging principle. The maximum error of the rotation speed in this experiment is measured to be 0.05%, indicating the minimum error in the current reports. By the compact size, low cost, and mass production potential of the integrated process, our approach is promising to readily enable the Bessel–Gaussian beam in widespread optical communication and micro-manipulation applications.

A moisture detection sensor for flour based on the gas in scattering media absorption spectroscopy

“…4 Laser spectroscopy-based methods have the advantage of high sensitivity and selectivity. [5][6][7][8][9][10][11][12][13][14][15][16][17] Usually laser spectroscopy can be divided into direct absorption spectroscopy and indirect absorption spectroscopy. [18][19][20][21][22] Gas in scattering media absorption spectroscopy (GAS-MAS) as an essential component of laser technology gives rise to the possibility of performing various gas detection tasks.…”

Simulation and parameter extraction of flying‐bird motion echo based on laser micro‐Doppler effect

“…Laser measurement technology has the merits of high sensitivity and high accuracy, [12][13][14][15][16][17][18][19][20] and it is widely used in various fields. [21][22][23][24][25] Laser Lidar can achieve high-precision motion estimation. Unfortunately, there is currently almost no laser micro-Doppler studies on birds, so further research is needed.…”

“…However, the motion forms of biomimetic flapping‐wing UAVs and birds are highly similar, a higher detection resolution is needed to effectively identify the motion differences between the biomimetic flapping‐wing UAVs and the flying‐birds. Laser measurement technology has the merits of high sensitivity and high accuracy, 12–20 and it is widely used in various fields 21–25 . Laser Lidar can achieve high‐precision motion estimation.…”

Multicomponent gas sensors based on photoacoustic spectroscopy technology: A review

“…Multicomponent sensing and analysis are critical in various fields, including chemical production, oil and gas, energy and power, atmospheric detection, and medical analysis 1–5 . Laser spectroscopy‐based detection has the merits of online measurement, high selectivity and sensitivity, 6–17 and is widely adopted for various applications 18–28 . Photoacoustic spectroscopy (PAS), as an indirect absorption spectroscopy technology, offers the advantages of high dynamic range, high sensitivity, and high selectivity.…”