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, A Schematic illustration of the chirped pulse amplification technique, p.4

. Schematic and . .. Homodyne-michelson-interferometer,

.. .. Schematic,

. , Unit Cell of a piezoelectric material with the center ion in black, (a) when the material is not electrically or mechanically excited, and (b) when the material is either mechanically stressed to produce an electric field or is excited by an electric field and physically deformed

. , Although the illustration relates to a piezoelectric solid, this is not a requirement for SAW propagation

. , A schematic of a basic saw device

. , A schematic showing voltage applied across the two comb-shaped electrodes produces stresses near the solid surface

, A Schematic of a surface acoustic wave device for generating a short pulse where p is the pitch of the IDT and a is the acoustic aperture, p.16

. , A schematic of SAW devices with (a) a linear up-chirp CIDT and (b)a linear down-chirp CIDT [54]

. , A schematic of a first order model of an IDT in which the IDT is modelled by an array of discrete sources at the centres of interdigital intervals

. , A Schematic representation of a single period transducer with the acoustic and electric ports

?. .. , Plots showing a variation in (a) the SAW velocity, (b) |?| and (c) the directivity ( ? ), for a variation in h ? (%), for LiNbO 3 with cut(YXl) 128, p.25

. , Plots showing a variation in (a) the SAW velocity, (b) |?| and (c) directivity ( ? ), for a variation in h ? (%), for LiNbO 3 with cut(YZ)

. , Measurement of the transmitted signal of the reference SAW device [74] using a network analyser

, Modulus of the spectral amplitude (in arbitrary units) for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, obtained using a delta function model, p.35

, Waveforms (amplitude in arbitrary units) obtained for a (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, obtained using a delta function model, p.35

, Group delay of the CIDT response obtained for a (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, obtained using a delta function model, p.35

. , Modulus of the spectral amplitude for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, obtained using a p-matrix model

. , Waveforms obtained for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, using a p-matrix model

. , Group delay obtained for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, using a p-matrix model

. , S11 measurement (b) S21 measurement (c) admittance measurement and (d) group delay measurement of the reference sample

, 8 (a) S11 measurement (b) S21 measurement (c) admittance measurement and (d) group delay measurement of the reference sample with a metal plate, p.38

. , LiNbO 3 ), layer (2) is the photo resist and layer (3) is the metal (aluminium) deposited on the substrate. Steps of the lift-off process : (I) substrate prepared for lithography, (II) photoresist added on the substrate, (III) the SAW design deposited using photo-lithography with a negative mask, (IV) metal deposited by evaporation, and (V) lift-off completed by cleaning the resist and removing the unwanted metal deposited on the substrate. 40 3.10 SEM images showing the photoresist profile of the designed electrodes at the end of the lithography process

. , b) the maximum pitch, and (c) a SEM image with the pitch measurement of the output, SEM images of a linearly chirped input IDT showing (a) the minimum pitch

, 12 (a) An image of a fabricated SAW device with a hyperbolic chirp IDT after dicing and (b) a picture of the SAW device wire-bonded on a PCB, p.43

. , 13 (a) S11 measurement and (b) S21 measurement of the SAW device with a linearly chirped IDT fabricated using the specification mentioned in Table. 3.3. The chirp bandwidth is 200 MHz-400 MHz

. , 14 (a) S11 measurement and (b) S21 measurement of the SAW device with a hyperbolically chirped IDT fabricated using the specification mentioned in Table. 3.3. The chirp bandwidth is 200 MHz-400 MHz

. , 15 (a) S11 measurement and (b) S21 measurement of the SAW device with a mean chirped IDT fabricated using the specification mentioned in Table. 3.3. The chirp bandwidth is 200 MHz-400 MHz

, A comparison between the (a) conductance and (b) susceptance of the SAW device responses with the three differently chirped IDTs, fabricated using the specification mentioned in Table. 3.3. The chirp bandwidth is

. .. Mhz, 44 3.17 Admittance measurements for the transmission, obtained from the fabricated SAW devices with (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp. The chirp bandwidth is 200 MHz-400 MHz

. , Group delay measurements, obtained from the fabricated SAW devices with (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, Chirp bandwidth is 200 MHz-400 MHz

. , Appearance of band gaps for a (a) single period IDT and (b) chirped IDT. (a) shows the dispersion relation of the Rayleigh wave in the periodic grating with the wavenumber k. (b) shows the variation of the band gap frequency range with the position within the CIDT

. , The power response at each electrode within the IDT with 500 electrodes (el) for a pitch p = 6.4 µm in (a) linear scale (b) log scale

. , The power response at each electrode within the IDT with 1000 electrodes (el) for a pitch p = 6.4 µm in (a) linear scale (b) log scale

. , The power response at each electrode within the IDT with 2000 electrodes (el) for a pitch p = 6.4 µm in (a) linear scale (b) log scale

. , The power response at each electrode within the IDT with 3000 electrodes (el) for a pitch p = 6.4 µm in (a) linear scale (b) log scale

. , The power response at each electrode within the IDT with 5000 electrodes (el) for a pitch p = 6.4 µm in (a) linear scale (b) log scale

, 3D plots of the power response at each electrode within the CIDTs with 300 electrodes generating (a) linear (b) hyperbolic and (c) mean chirps respectively, p.50

, 26 3D plots of the power response at each electrode within the CIDTs with 3000 electrodes generating (a) linear (b) hyperbolic and (c) mean chirps respectively, p.51

. , Plots of the power response of the waves exiting on the left and the right of the down chirped IDT with 300 electrodes generating (a) linear (b) hyperbolic and (c) mean chirps respectively

. , Plots of the power response of the waves exiting on the left and the right of the down chirped IDT with 3000 electrodes generating (a) linear (b) hyperbolic and (c) mean chirps respectively

. , 3D plots of the power response at each electrode within the up-chirped CIDTs with 300 electrodes, designed using the p-matrix model, corresponding the fabricated devices, generating (a) linear (b) hyperbolic and (c) mean chirps respectively

. , 3D plots of the power response at each electrode within the up-chirped CIDTs with 3000 electrodes, designed using the p-matrix model, corresponding the fabricated devices, generating (a) linear (b) hyperbolic and (c) mean chirps respectively

. , Plots of the power response of the waves exiting on the left and the right of the up chirped IDT with 300 electrodes generating (a) linear (b) hyperbolic and (c) mean chirps respectively

. , A plot showing the total voltage span of the interferometer obtained by varing the path difference between the beams along the two reference arms using a phased mirror

. , Plot of ?u(x, t) at a given position as a function of ?t, for a 10-ns Gaussian pulse. (b) Experimental result as a function of ?t obtained by changing the path length difference in the interferometer, Dependence of the pulse measurement with the time-delay ?t. (a)

. , Measurement of the SAW pulse at various positions along the chirped interdigital transducer

. , b) a hyperbolic chirp and (c) a mean chirp, obtained using a p-matrix model, |H(?)| for (a) a linear chirp

. , b) a hyperbolic chirp and (c) a mean chirp, by performing an inverse Fourier transform on the responses calculated using a p-matrix model as shown in figure 5.1

, Normalized input chirp waveforms obtained by performing an inverse Fourier transform on the response of filter 1 (H(?) I1 ) for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, p.81

. , A plot showing the inverse of the H(?) function for a linear CIDT, and (b) a window function G(f ) obtained using equation 5.4

, 5 Normalized inverse chirp waveforms for filter 2, obtained for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, using a p-matrix model, p.83

. , 6 Normalized input chirp waveforms obtained for filter 3, by windowing the transmission response of filter 1 for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp

, obtained for the three chirp cases, by using filter 1, when the threshold condition is applied on the input chirp waveform, p.85

, obtained for the three chirp cases, by using filter 2, when the threshold condition is applied on the input chirp waveform, p.85

. .. , obtained for the three chirp cases, by using filter 3 when the threshold condition is applied on the input chirp waveform, p.86

. , Admittance measurements for the transmission, obtained from the fabricated SAW devices with (a) A linear chirp, (b) A hyperbolic chirp and (c) A mean chirp, Chirp bandwidth is 200 MHz-400 MHz

, Chirp waveforms obtained for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, using a the admittance measurements shown in figure 5.10, p.88

. , Normalized inverse chirp waveforms obtained for (a) a linear chirp, (b) a hyperbolic chirp and (c) a mean chirp, using a the admittance measurements shown in figure 5

. , A schematic of the pulse compression experiment to measure the responses of the fabricated SAW devices

. , b) a hyperbolic chirp and (c) a mean chirp

. , b) a hyperbolic chirp and (c) a mean chirp, for B 0 =12.5 MHZ-142

. Mhz, MHz and (b)The pulse amplitude |P (?)| shown in the frequency domain, p.93

, List of Tables

. , Piezoelectric materials used for SAW generation, where SAW is surface acoustic wave, R is Rayleigh wave, P SAW is the pseudo SAW waves and BG is the Bleustein-Gulyaev wave

. .. , Design parameters used for the fabricated SAW devices, p.42

. , The h ? values for different heights (h) used to study the variation in the directivity of the CIDTs

. , Amplitude measurements of the chirp with different attenuations for SNR estimations

, 2 SNR and displacement calculations using measurement values from Table

. , Amplitude measurements at the output of every optical component of the interferometer

, A p values obtained on application of the threshold condition, for the short pulses generated using different types of input chirps described in section 5.1.1, vol.87

. , Amplitude gain factor of the short pulse generated using different types of input chirps described in section 5, vol.87