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Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry

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Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry. / San Juan Mucientes, Marta; McNair, Robert; Peasey, Adrian et al.
2018. Poster session presented at 2018 MRS Spring Meeting, Phoenix, Arizona, United States.

Research output: Contribution to conference - Without ISBN/ISSN Poster

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APA

San Juan Mucientes, M., McNair, R., Peasey, A., Shao, S., Wengraf, J., Lulla Ramrakhiyani, K., Robinson, B. J., & Kolosov, O. V. (2018). Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry. Poster session presented at 2018 MRS Spring Meeting, Phoenix, Arizona, United States.

Vancouver

San Juan Mucientes M, McNair R, Peasey A, Shao S, Wengraf J, Lulla Ramrakhiyani K et al.. Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry. 2018. Poster session presented at 2018 MRS Spring Meeting, Phoenix, Arizona, United States.

Author

San Juan Mucientes, Marta ; McNair, Robert ; Peasey, Adrian et al. / Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry. Poster session presented at 2018 MRS Spring Meeting, Phoenix, Arizona, United States.

Bibtex

@conference{89bc8151013943df9f59577c385b3346,
title = "Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry",
abstract = "Development of novel high frequency Si, Si3N4, and graphene based micro-and nano-electromechanical systems (MEMS and NEMS) requires suitable characterization methods with nanoscale spatial resolution, high frequency (HF) response and high sensitivity. As spatial resolution of existing methods such as Laser Doppler Vibrometry (LDV) is limited by the light wavelength to the micrometre scale [1], it is tempting to use atomic force microscope (AFM) techniques offering nanoscale resolution. Here we use AFM to analyse the vibrations of nanoscale thin membranes over the frequency range from kHz to several MHz using both linear and nonlinear mechanisms for their excitation and detection.Our model system is a Si3N4 membrane (200 nm thickness, 500x500 um2, Agar Scientific) on a Si substrate. The AFM (Multimode, Nanoscope 8, Bruker) was modified with a piezoceramic transducer driven by the function generator to excite sample vibrations from kHz to about 10 MHz, with the resulting cantilever deflection detected by a standard lock-in-amplifier. The reference optical vibrometry (OFV-2670 and UHF-120, Polytec) found the membrane fundamental vibrational mode at ~250 KHz suggesting it to be under high tensile stress.The core idea of our study was to explore the possibility of detection HF membrane vibrations via AFM and effect of the probing tip contact on the resonance frequency. We used three AFM modes: 1) Force Modulation Microscopy (FMM) with tip vibrations detected at the excitation frequency, 2) nonlinear off-resonance regime where HF sample vibration is modulated at low frequency, and cantilever response measured at the modulation frequency (Ultrasonic Force Microscopy, UFM [2]), 3) UFM resonance regime, where the modulation frequency was around the membrane resonance (M-UFM). While the edge of a membrane was not detectable via topography, it was clearly visible in all ultrasonic modes. FMM mapping at swept excitation frequency showed that the cantilever-tip loading of the membrane increasingly shifted the resonance frequency down as the tip moved towards the centre, with the maximum response reached at a certain distance from the edge, suggesting an optimum position for the detection of vibrations. In M-UFM mode we found that the membrane resonance was also detectable, even though there was no resonance frequency component in the driving oscillation spectrum. We attributed this to the nonlinear nature of the tip-membrane interaction that produced the localised force at the resonance modulation frequency. This study shows that ultrasonic AFM modes will allow the exploration of the vibration of MEMS/NEMS structures of sub-um dimensions including 2D materials based NEMS. [1] Gates RS, Pratt JR, Nanotechnology, 2012, 23(37).[2] Bosse JL et al., Journal of Applied Physics, 2014, 115(14):144304.",
keywords = "Nanomechanics, SPM, MEMS, Graphene, 2D materials",
author = "{San Juan Mucientes}, Marta and Robert McNair and Adrian Peasey and Shouqi Shao and Joshua Wengraf and {Lulla Ramrakhiyani}, Kunal and Robinson, {Benjamin James} and Kolosov, {Oleg Victor}",
year = "2018",
month = apr,
day = "4",
language = "English",
note = "2018 MRS Spring Meeting ; Conference date: 02-04-2018 Through 06-04-2018",
url = "http://www.mrs.org/spring2018",

}

RIS

TY - CONF

T1 - Comparison of Local Dynamic Response of MEMS Nanostructures Using Ultrasonic Force Microscopy and Laser Doppler Vibrometry

AU - San Juan Mucientes, Marta

AU - McNair, Robert

AU - Peasey, Adrian

AU - Shao, Shouqi

AU - Wengraf, Joshua

AU - Lulla Ramrakhiyani, Kunal

AU - Robinson, Benjamin James

AU - Kolosov, Oleg Victor

PY - 2018/4/4

Y1 - 2018/4/4

N2 - Development of novel high frequency Si, Si3N4, and graphene based micro-and nano-electromechanical systems (MEMS and NEMS) requires suitable characterization methods with nanoscale spatial resolution, high frequency (HF) response and high sensitivity. As spatial resolution of existing methods such as Laser Doppler Vibrometry (LDV) is limited by the light wavelength to the micrometre scale [1], it is tempting to use atomic force microscope (AFM) techniques offering nanoscale resolution. Here we use AFM to analyse the vibrations of nanoscale thin membranes over the frequency range from kHz to several MHz using both linear and nonlinear mechanisms for their excitation and detection.Our model system is a Si3N4 membrane (200 nm thickness, 500x500 um2, Agar Scientific) on a Si substrate. The AFM (Multimode, Nanoscope 8, Bruker) was modified with a piezoceramic transducer driven by the function generator to excite sample vibrations from kHz to about 10 MHz, with the resulting cantilever deflection detected by a standard lock-in-amplifier. The reference optical vibrometry (OFV-2670 and UHF-120, Polytec) found the membrane fundamental vibrational mode at ~250 KHz suggesting it to be under high tensile stress.The core idea of our study was to explore the possibility of detection HF membrane vibrations via AFM and effect of the probing tip contact on the resonance frequency. We used three AFM modes: 1) Force Modulation Microscopy (FMM) with tip vibrations detected at the excitation frequency, 2) nonlinear off-resonance regime where HF sample vibration is modulated at low frequency, and cantilever response measured at the modulation frequency (Ultrasonic Force Microscopy, UFM [2]), 3) UFM resonance regime, where the modulation frequency was around the membrane resonance (M-UFM). While the edge of a membrane was not detectable via topography, it was clearly visible in all ultrasonic modes. FMM mapping at swept excitation frequency showed that the cantilever-tip loading of the membrane increasingly shifted the resonance frequency down as the tip moved towards the centre, with the maximum response reached at a certain distance from the edge, suggesting an optimum position for the detection of vibrations. In M-UFM mode we found that the membrane resonance was also detectable, even though there was no resonance frequency component in the driving oscillation spectrum. We attributed this to the nonlinear nature of the tip-membrane interaction that produced the localised force at the resonance modulation frequency. This study shows that ultrasonic AFM modes will allow the exploration of the vibration of MEMS/NEMS structures of sub-um dimensions including 2D materials based NEMS. [1] Gates RS, Pratt JR, Nanotechnology, 2012, 23(37).[2] Bosse JL et al., Journal of Applied Physics, 2014, 115(14):144304.

AB - Development of novel high frequency Si, Si3N4, and graphene based micro-and nano-electromechanical systems (MEMS and NEMS) requires suitable characterization methods with nanoscale spatial resolution, high frequency (HF) response and high sensitivity. As spatial resolution of existing methods such as Laser Doppler Vibrometry (LDV) is limited by the light wavelength to the micrometre scale [1], it is tempting to use atomic force microscope (AFM) techniques offering nanoscale resolution. Here we use AFM to analyse the vibrations of nanoscale thin membranes over the frequency range from kHz to several MHz using both linear and nonlinear mechanisms for their excitation and detection.Our model system is a Si3N4 membrane (200 nm thickness, 500x500 um2, Agar Scientific) on a Si substrate. The AFM (Multimode, Nanoscope 8, Bruker) was modified with a piezoceramic transducer driven by the function generator to excite sample vibrations from kHz to about 10 MHz, with the resulting cantilever deflection detected by a standard lock-in-amplifier. The reference optical vibrometry (OFV-2670 and UHF-120, Polytec) found the membrane fundamental vibrational mode at ~250 KHz suggesting it to be under high tensile stress.The core idea of our study was to explore the possibility of detection HF membrane vibrations via AFM and effect of the probing tip contact on the resonance frequency. We used three AFM modes: 1) Force Modulation Microscopy (FMM) with tip vibrations detected at the excitation frequency, 2) nonlinear off-resonance regime where HF sample vibration is modulated at low frequency, and cantilever response measured at the modulation frequency (Ultrasonic Force Microscopy, UFM [2]), 3) UFM resonance regime, where the modulation frequency was around the membrane resonance (M-UFM). While the edge of a membrane was not detectable via topography, it was clearly visible in all ultrasonic modes. FMM mapping at swept excitation frequency showed that the cantilever-tip loading of the membrane increasingly shifted the resonance frequency down as the tip moved towards the centre, with the maximum response reached at a certain distance from the edge, suggesting an optimum position for the detection of vibrations. In M-UFM mode we found that the membrane resonance was also detectable, even though there was no resonance frequency component in the driving oscillation spectrum. We attributed this to the nonlinear nature of the tip-membrane interaction that produced the localised force at the resonance modulation frequency. This study shows that ultrasonic AFM modes will allow the exploration of the vibration of MEMS/NEMS structures of sub-um dimensions including 2D materials based NEMS. [1] Gates RS, Pratt JR, Nanotechnology, 2012, 23(37).[2] Bosse JL et al., Journal of Applied Physics, 2014, 115(14):144304.

KW - Nanomechanics

KW - SPM

KW - MEMS

KW - Graphene

KW - 2D materials

M3 - Poster

T2 - 2018 MRS Spring Meeting

Y2 - 2 April 2018 through 6 April 2018

ER -