The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Din Ping Tsai - One of the best experts on this subject based on the ideXlab platform.
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Implementation of a short‐tip tapping‐mode Tuning Fork near‐field scanning optical microscope
Journal of Microscopy, 2003Co-Authors: N H Lu, C W Huang, C F Yu, Y H Fu, C Y Chen, Din Ping TsaiAbstract:Summary We present the implementation of a short-tip tapping-modeTuning Fork near-field scanning optical microscope. Tappingfrequency dependences of the piezoelectric signal amplitudesfor a bare Tuning Fork fixed on the ceramic plate, a short-tiptapping-mode Tuning Fork scheme and an ordinary tapping-mode Tuning Fork configuration with an 80-cm optical fibreattached are demonstrated and compared. Our experimentalresults show that this new short-tip tapping-mode Tuning Forkscheme provides a stable and high Q factor at the tappingfrequency of the Tuning Fork and will be very helpful when longoptical fibre probes have to be used in an experiment. Bothcollection and excitation modes of short-tip tapping-mode tun-ing Fork near-field scanning optical microscope are appliedto study the near-field optical properties of a single-modetelecommunication optical fibre and a green InGaN/GaNmultiquantum well light-emitting diode. Introduction Advances in nanoscience and nanotechnology advocate rapidprogress in new techniques and instruments which have theability to perform nanoscale fabrication or to offer high spatialresolution characterization down to the nanometre dimen-sion. Owing to its versatile applications in nanostructurefabrication (Massanell
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DESIGN AND CONSTRUCTION OF A SHORT-TIP TAPPING-MODE Tuning Fork NEAR-FIELD SCANNING OPTICAL MICROSCOPE
International Journal of Nanoscience, 2003Co-Authors: C W Huang, N H Lu, C F Yu, Y H Fu, Din Ping Tsai, C Y Chen, Pei WangAbstract:The design and construction of a tapping-mode Tuning Fork with a short fiber probe as the force sensing element for near-field scanning optical microscopy is reported. This type of near-field scanning optical microscopy provides a stable and high Q factor at the tapping frequency of the Tuning Fork, and thus gives high quality NSOM and AFM images of samples. We present results obtained by using the short tip tapping-mode Tuning Fork near-field scanning optical microscopy measurements performed on the endfaces of a single mode telecommunication optical fiber and a silica-based buried channel waveguide.
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Short fiber probe scheme for tapping-mode Tuning Fork near-field scanning optical microscopy
Nano-Optics and Nano-Structures, 2002Co-Authors: C W Huang, N H Lu, C F Yu, Din Ping Tsai, C Y Chen, Pei WangAbstract:Construction of a tapping-mode Tuning Fork with a short fiber probe as the force sensing element for near-field scanning optical microscopy is reported. This type of near-field scanning optical microscopy provides stable and high Q factor at the tapping frequency of the Tuning Fork, and thus gives high quality NSOM and AFM images of samples. We present results obtained by using the short tip tapping-mode Tuning Fork near-field scanning optical microscopy measurements performed on a single mode telecommunication optical fiber and a silica based buried channel waveguide.© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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tapping mode Tuning Fork force sensing for near field scanning optical microscopy
Applied Physics Letters, 1998Co-Authors: Din Ping Tsai, Yuan Ying LuAbstract:A tapping-mode Tuning Fork force-sensing method for near-field scanning optical microscope is reported. Use of the tapping-mode Tuning Fork with mechanically asymmetric excitation generates better stability and sensitivity than in the shear force mode. Comparison of force curves for the two methods demonstrate that the tapping-mode Tuning Fork method provides a simpler and more sensitive method for near-field measurements. The method is demonstrated by imaging a sample consisting of 500 nm standard polystyrene spheres on silica in both air and water.
Bo You - One of the best experts on this subject based on the ideXlab platform.
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Design, Development and Testing of Quartz Tuning Fork Temperature Sensor
Key Engineering Materials, 2011Co-Authors: Bo YouAbstract:In this paper, a low cost quartz Tuning Fork temperature sensor adopting H-shaped Tuning Fork resonator to address miniaturization, high resolution and high stability has been designed, developed and tested. The quartz Tuning temperature sensor is designed vibrating in flexural mode with a new thermo-sensitive cut. The quartz Tuning Fork temperature sensor consists of two prongs connected at one end of crystalline quartz plate with thin-film metal electrodes deposited on the faces, which is used to produce vibration in response to alternating voltages and detecting the resonance frequency in the meantime. When an external temperature is change, there is a shift in its natural frequency. Based on this principle, a resonant thermometer is designed. Finite element method is used to analyze the vibratory modes and optimize the structure. The whole structure is 500μm thickness, the length of Tuning Fork arm is 3076μm and the width of Tuning Fork arm is 600um, the frequency of Tuning Fork is about 37kHz with a sensitivity of rough 85 ppm/°C. The experimental results shown that a temperature accuracy of 0.01 °C and a resolution of 0.005 °C within temperature range from 0 °C to 100 °C. All these research are helpful to design satisfactory performance of the sensor for temperature measurement.
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Study on quartz Tuning Fork resonator as micro temperature
2010 IEEE 5th International Conference on Nano Micro Engineered and Molecular Systems, 2010Co-Authors: Bo YouAbstract:A miniature digital temperature sensor with the ZY cut quartz crystal Tuning Fork resonators was developed. The quartz crystal Tuning Fork resonators have the characteristic that the resonance frequency changes by the external temperature, which achieves high sensitivity and high-speed response and frequency stability by a sample structure. The quartz crystal Tuning Fork resonators are square cross section Tuning Forks whose arms are vibrating in flexure-mode with clamped-free boundary conditions. We designed and analyzed the thermo characteristics of the quartz crystal Tuning Fork resonator by theory and finite element method. The design and implement of a FPGA-based frequency measurement system for quartz crystal Tuning Fork temperature sensor is proposed. Using different design technique a bandwidth of 40 MHz and a resolution of 0.02 Hz is achieved. The experimental results shown that a temperature accuracy of 0.05 °C and a resolution of 0.02 °C within temperature range from −10 °C to 150 °C.
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NEMS - A high sensitivity quartz Tuning Fork temperature sensor
2009 4th IEEE International Conference on Nano Micro Engineered and Molecular Systems, 2009Co-Authors: Bo YouAbstract:In this paper, a highly sensitive temperature sensor based on quartz Tuning Fork resonators is reported. The temperature sensor is configured by ZY (110°/10°) Cut quartz crystal wafer based bulk acoustic wave (BAW) Tuning Fork resonators whose operating frequency is at 31 KHz. The ideal thermo-sensitive ZY cut for quartz Tuning Fork resonators is analyzed with the theory. The characterization of a flexural mode Tuning Fork resonator whose inherent frequency sensitivity to temperature changes is reduced is presented. A Finite Element Method (FEM) has been used in the deign process. The specific cut quartz Tuning Fork is fabricated using photolithography and the etching technology. The temperature sensor is used to measure various temperature in the range −50–140 Degree C. The measurement results show that the Tuning Fork resonators based temperature sensor exhibits excellent sensitivity and short-term repeatability.
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Smart temperature sensor with quartz Tuning Fork resonators
2008 9th International Conference on Solid-State and Integrated-Circuit Technology, 2008Co-Authors: Bo YouAbstract:This paper discusses a smart temperature sensor system that comprises of a high performance quartz Tuning Fork temperature sensor, interface with CMOS circuitry and control algorithm for reconfiguration. The ideal thermo-sensitive cut for quartz Tuning Fork resonators is analyzed with the theory. The specific cut quartz Tuning Fork was fabricated using photolithography and the etching technology. And the Tuning Fork sensing element (4 × 1 × 0.2 mm3) is so small that can be housed in the capsule (?2 × 6 mm). The smart temperature sensor along with the interface IC to FPGA and special control algorithm may easily realize the sensor reconfiguration and the auto-calibration in the field. The experimental result indicates that the sensitivity of this sensor can reach 65 ppm/°in the temperature range from-20 to 140°, it guarantees that precision is 0.01°, the resolution is 0.001°, and the response time is 1 s.
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Development of quartz Tuning Fork temperature sensors
2008 Symposium on Piezoelectricity Acoustic Waves and Device Applications, 2008Co-Authors: Bo You, Xue-fei ZhaoAbstract:A temperature sensing technique taking thermal sensitive quartz Tuning Fork vibration arm as sensitive components and output of digital frequency is presented. In the design of quartz Tuning Fork temperature sensor, selecting the cut type of quartz Tuning Fork according to the each anisotropic nature of quartz Tuning Fork, so that there is a linear relationship between quartz Tuning Fork frequency and environment temperature. Based on the principle of mechanical vibration, deriving differential equations of Tuning Fork resonator vibration, extracting characteristic parameters, analyzing the temperature-frequency characteristics, conducting optimum design of structure is performed. We evaluate the sensor through the established quartz Tuning Fork temperature sensor test system. The experimental results show that the sensor can work within -50square~+200square, the measurement accuracy is up to 0.05square, and it has a good long-term stability.
Yuan Ying Lu - One of the best experts on this subject based on the ideXlab platform.
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tapping mode Tuning Fork force sensing for near field scanning optical microscopy
Applied Physics Letters, 1998Co-Authors: Din Ping Tsai, Yuan Ying LuAbstract:A tapping-mode Tuning Fork force-sensing method for near-field scanning optical microscope is reported. Use of the tapping-mode Tuning Fork with mechanically asymmetric excitation generates better stability and sensitivity than in the shear force mode. Comparison of force curves for the two methods demonstrate that the tapping-mode Tuning Fork method provides a simpler and more sensitive method for near-field measurements. The method is demonstrated by imaging a sample consisting of 500 nm standard polystyrene spheres on silica in both air and water.
N F Van Hulst - One of the best experts on this subject based on the ideXlab platform.
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atomic steps with Tuning Fork based noncontact atomic force microscopy
Applied Physics Letters, 1999Co-Authors: W H J Rensen, A G Ruiter, N F Van Hulst, P E WestAbstract:Tuning Forks as tip-sample distance detectors are a promising and versatile alternative to conventional cantilevers with optical beam deflection in noncontact atomic force microscopy (AFM). Both theory and experiments are presented to make a comparison between conventional and Tuning-Fork-based AFM. Measurements made on a Si(111) sample show that both techniques are capable of detecting monatomic steps. The measured step height of 0.33 nm is in agreement with the accepted value of 0.314 nm. According to a simple model, interaction forces of 30 pN are obtained for the Tuning-Fork-based setup, indicating that, at the proper experimental conditions, the sensitivity of such an instrument is competitive to conventional lever-based AFM.
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Tuning Fork shear-force feedback.
Ultramicroscopy, 1998Co-Authors: A G Ruiter, K O Van Der Werf, J A Veerman, M F Garcia-parajo, W H Rensen, N F Van HulstAbstract:Investigations have been performed on the dynamics of a distance regulation system based on an oscillating probe at resonance. This was examined at a Tuning Fork shear-force feedback system, which is used as a distance control mechanism in near-field scanning optical microscopy. In this form of microscopy, a tapered optical fiber is attached to the Tuning Fork and scanned over the sample surface to be imaged. Experiments were performed measuring both amplitude and phase of the oscillation of the Tuning Fork as a function of driving frequency and tip-sample distance. These experiments reveal that the resonance frequency of the Tuning Fork changes upon approaching the sample. Both the amplitude and the phase of the Tuning Fork can be used as distance control parameter in the feedback system. Using the amplitude a second-order behavior is observed, while with phase only a first-order behavior is observed. Numerical calculations confirm these observations. This first-order behavior results in an improved stability of the feedback system. As an example, a sample consisting of DNA strands on mica was imaged which showed the height of the DNA as 1.4 +/- 0.2 nm.
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Dynamic behaviour of Tuning Fork shear-force feedback
Applied Physics Letters, 1997Co-Authors: A G Ruiter, K O Van Der Werf, J A Veerman, N F Van HulstAbstract:The dynamics of a Tuning Fork shear-force feedback system, used in a near-field scanning optical microscope, have been investigated, Experiments, measuring amplitude and phase of the Tuning Fork oscillation as a function of driving frequency and tip-sample distance, reveal that the resonance frequency of the Tuning Fork changes upon approaching the sample. Either amplitude or phase of the Tuning Fork can be used as distance control parameter in the feedback system. Using amplitude a second-order behavior is observed while with phase only a first-order behavior is observed, and confirmed by numerical calculations. This first-order behavior results in an improved stability of our feedback system, A sample consisting of DNA strands on mica was imaged which showed a height of the DNA of 1.4 nm
A G Ruiter - One of the best experts on this subject based on the ideXlab platform.
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atomic steps with Tuning Fork based noncontact atomic force microscopy
Applied Physics Letters, 1999Co-Authors: W H J Rensen, A G Ruiter, N F Van Hulst, P E WestAbstract:Tuning Forks as tip-sample distance detectors are a promising and versatile alternative to conventional cantilevers with optical beam deflection in noncontact atomic force microscopy (AFM). Both theory and experiments are presented to make a comparison between conventional and Tuning-Fork-based AFM. Measurements made on a Si(111) sample show that both techniques are capable of detecting monatomic steps. The measured step height of 0.33 nm is in agreement with the accepted value of 0.314 nm. According to a simple model, interaction forces of 30 pN are obtained for the Tuning-Fork-based setup, indicating that, at the proper experimental conditions, the sensitivity of such an instrument is competitive to conventional lever-based AFM.
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Tuning Fork shear-force feedback.
Ultramicroscopy, 1998Co-Authors: A G Ruiter, K O Van Der Werf, J A Veerman, M F Garcia-parajo, W H Rensen, N F Van HulstAbstract:Investigations have been performed on the dynamics of a distance regulation system based on an oscillating probe at resonance. This was examined at a Tuning Fork shear-force feedback system, which is used as a distance control mechanism in near-field scanning optical microscopy. In this form of microscopy, a tapered optical fiber is attached to the Tuning Fork and scanned over the sample surface to be imaged. Experiments were performed measuring both amplitude and phase of the oscillation of the Tuning Fork as a function of driving frequency and tip-sample distance. These experiments reveal that the resonance frequency of the Tuning Fork changes upon approaching the sample. Both the amplitude and the phase of the Tuning Fork can be used as distance control parameter in the feedback system. Using the amplitude a second-order behavior is observed, while with phase only a first-order behavior is observed. Numerical calculations confirm these observations. This first-order behavior results in an improved stability of the feedback system. As an example, a sample consisting of DNA strands on mica was imaged which showed the height of the DNA as 1.4 +/- 0.2 nm.
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Dynamic behaviour of Tuning Fork shear-force feedback
Applied Physics Letters, 1997Co-Authors: A G Ruiter, K O Van Der Werf, J A Veerman, N F Van HulstAbstract:The dynamics of a Tuning Fork shear-force feedback system, used in a near-field scanning optical microscope, have been investigated, Experiments, measuring amplitude and phase of the Tuning Fork oscillation as a function of driving frequency and tip-sample distance, reveal that the resonance frequency of the Tuning Fork changes upon approaching the sample. Either amplitude or phase of the Tuning Fork can be used as distance control parameter in the feedback system. Using amplitude a second-order behavior is observed while with phase only a first-order behavior is observed, and confirmed by numerical calculations. This first-order behavior results in an improved stability of our feedback system, A sample consisting of DNA strands on mica was imaged which showed a height of the DNA of 1.4 nm
