An encapsulated optical microsphere sensor for ultrasound detection and photoacoustic imaging

Sun, Jialve; Meng, Junling; Tang, Shui‐Jing; Li, Changhui

doi:10.1007/s11433-021-1806-3

Cited by 19 publications

(8 citation statements)

References 33 publications

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“…Examples of resonance-based ultrasound sensors include Fabry–Perot interferometer (FPI), 33 , 34 fiber laser, 19 , 35 Bragg grating, 36 , 37 and whispering-gallery mode (WGM) microresonators. 38 , 39 In comparison, nonresonance-based optical ultrasound sensors mainly utilize free-space methods or photoelastic approaches, such as Michelson interferometer, 40 , 41 Mach–Zehnder interferometer (MZI), 42 , 43 probe beam deflection technique, 44 , 45 or laser Doppler sensors. 46 In this review, we focus on the resonance-based optical ultrasound sensors.…”

Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

“… 98 Sun et al. 38 proposed an method to fabricate microsphere sensors and developed two types of encapsulated microsphere resonators with different cavity materials. The silica microsphere sensor has a

factor of

and 160 Pa NEP at 20 MHz, whereas the PS microsphere sensor has a

factor of

and 100 Pa NEP at 20 MHz.…”

Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

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Optical ultrasound sensors for photoacoustic imaging: a review

Zhu,

Cao,

et al. 2024

J. Biomed. Opt.

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. Significance Photoacoustic (PA) imaging is an emerging biomedical imaging modality that can map optical absorption contrast in biological tissues by detecting ultrasound signal. Piezoelectric transducers are commonly used in PA imaging to detect the ultrasound signals. However, piezoelectric transducers suffer from low sensitivity when the dimensions are reduced and are easily influenced by electromagnetic interference. To avoid these limitations, various optical ultrasound sensors have been developed and shown their great potential in PA imaging. Aim Our study aims to summarize recent progress in optical ultrasound sensor technologies and their applications in PA imaging. Approach The commonly used optical ultrasound sensing techniques and their applications in PA systems are reviewed. The technical advances of different optical ultrasound sensors are summarized. Results Optical ultrasound sensors can provide wide bandwidth and improved sensitivity with miniatured size, which enables their applications in PA imaging. Conclusions The optical ultrasound sensors are promising transducers in PA imaging to provide higher-resolution images and can be used in new applications with their unique advantages.

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Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

factor of

and 160 Pa NEP at 20 MHz, whereas the PS microsphere sensor has a

factor of

and 100 Pa NEP at 20 MHz.…”

Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

Optical ultrasound sensors for photoacoustic imaging: a review

Zhu,

Cao,

et al. 2024

J. Biomed. Opt.

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“…In cavity optomechanical systems, displacement of the cavity can be optically read out, via the optomechanical coupling. As the response is enhanced by the mechanical resonance, and the readout sensitivity is enhanced by the optical resonance, cavity optomechanical systems provide an ideal sensing platform for displacement [16,17], mass [18][19][20], force [21][22][23], acceleration [24,25], magnetic field [26][27][28][29][30][31][32], and acoustic wave [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47], etc.…”

Section: Introductionmentioning

confidence: 99%

“…Polymer materials are generally soft and can be easily deformed by acoustic waves, and therefore provide large sensing signals. Various polymer microcavities such as polystyrene [33,34], SU8 [35] and polydimethylsiloxane (PDMS) [36], have been fabricated for ultrasound sensing, and achieved sensitivity at * libeibei@iphy.ac.cn Pascal level and high bandwidth of tens-to-hundreds of MHz. A Fabry-Perot cavity has been fabricated at the end of an optical fiber using UV curable epoxy, which has realized a sensitivity of mPa/Hz 1/2 at the tens of MHz frequency range [37].…”

Section: Introductionmentioning

confidence: 99%

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High sensitivity air-coupled MHz frequency ultrasound detection using on-chip microcavities

Hao¹,

Hu²,

Lei³

et al. 2022

Preprint

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Cavity optomechanical systems provide an ideal platform for ultrasound sensing, due to its dualresonance enhanced sensitivity. Here we realize high sensitivity air-coupled ultrasound sensing in the megahertz (MHz) frequency range, using a microtoroid cavity. Benefitting from both the high optical Q factor (∼10 7 ) and mechanical Q factor (∼700), we achieve sensitivity of 46 µPa/Hz 1/2 -10 mPa/Hz 1/2 in a frequency range of 0.25-3.2 MHz. Thermal-noise-limited sensitivity is realized around the mechanical resonance at 2.56 MHz, in a frequency range of 0.6 MHz. We also observe the second-and third-order mechanical sidebands, when driving the microcavity with an ultrasonic wave at the mechanical resonance and quantitatively study the intensities of each mechanical sideband as a function of the mechanical displacement. Measuring the combination of signal to noise ratios at all the sidebands has the potential to extend the dynamic range of displacement sensing.

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Integrated Optical Microrings on Fiber Facet for Broadband Ultrasound Detection

Sun,

Hou,

Feng

et al. 2024

Advanced Sensor Research

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The miniature optical fiber ultrasound sensor with high sensitivity and bandwidth is important for the field of ultrasonic detection. In this study, a unique fiber ultrasound sensor via integrating optical microrings on a multicore fiber facet is reported. The results demonstrate this sensor can be used in liquid environment and has high sensitivity with broadband bandwidth. The detector's equivalent noise pressure (NEP) can reach 13.2 mPa Hz−1/2 with a broadband ultrasound response over 250 MHz (103 MHz in −6 dB). Besides, this sensor is resistant to environmental impurities. The sensor is successfully applied to photoacoustic microscopy (PAM) with a lateral resolution of 5 µm and an axial resolution of 6.6 µm. Furthermore, an integrated transceiver structure for ultrasound/photoacoustic detection is proposed, which has great application prospects for using in constrained tiny spaces, such as endoscopy, or closely scanning over uneven surfaces.

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An encapsulated optical microsphere sensor for ultrasound detection and photoacoustic imaging

Cited by 19 publications

References 33 publications

Optical ultrasound sensors for photoacoustic imaging: a review

Optical ultrasound sensors for photoacoustic imaging: a review

High sensitivity air-coupled MHz frequency ultrasound detection using on-chip microcavities

Integrated Optical Microrings on Fiber Facet for Broadband Ultrasound Detection

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