Acousto-Optic Modulator Driven by Surface Acoustic Waves

Kakio, Shoji

doi:10.12693/aphyspola.127.15

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Under a 17 V and 195 MHz driving voltage, about 84% diffractive efficiency was obtained. 318 Similarly, such a device is based on a Ti diffused waveguide and thus presents a large device size (with an IDT length of 2 or 3 mm). In addition, due to the large device size in bulk LN, the modulation frequency is typically limited to several hundreds of megahertz.…”

Section: Cavity Optomechanicsmentioning

confidence: 99%

Advances in lithium niobate photonics: development status and perspectives

Chen

et al. 2022

Adv. Photon.

108

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Section: Cavity Optomechanicsmentioning

confidence: 99%

Advances in lithium niobate photonics: development status and perspectives

Chen

et al. 2022

Adv. Photon.

108

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“…Although various types of holographic display technologies are currently available, these displays are not suitable for use in portable devices because of their large volume and power consumption, high cost, and system complexity. For real-time 3-dimensional (3D) holographic video in free space, a spatial light modulator (SLM) is necessary to modulate the intensity, direction, phase, and focal length of the light beam [1][2][3][4]. Most of the current technology in SLMs employs optical addressing technology that either moves the light source directly to form a 3D image or uses a secondary light source with no mechanical movements [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effective Light Beam Modulation by Chirp IDT on a Suspended LiNbO3 Membrane for 3D Holographic Displays

Lee

2020

Sensors

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An acousto-optic (AO) holographic display unit based on a suspended waveguide membrane was developed. The AO unit consists of a wide bandwidth chirp interdigital transducer (IDT) on a 20 µm thick suspended crystalline 128° YX LiNbO3 membrane, a light blocker with a 20 µm hole near the entrance, and an active lens near the exit. The 20 µm thickness of the floating membrane significantly enhanced surface acoustic wave (SAW) confinement. The light blocker was installed in front of the AO unit to enhance the coupling efficiency of the incident light to the waveguide membrane and to remove perturbations to the photodetector during measurement at the exit region. The active lens was vertically attached to the waveguide sidewall to collect the diffracted beam without loss and to modulate the focal length in free space through the applied voltage. As SAWs were radiated from the IDT, a Bragg grating with periodic refractive indexes was formed along the waveguide membrane. The grating diffracted incident light. The deflection angle and phase, and the intensity of the light beam were controlled by the SAW frequency and input power, respectively. The maximum diffraction efficiency achieved was approximately 90% for a 400 MHz SAW. COMSOL simulation and coupling of mode modeling were performed to optimize design parameters and predict device performance.

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“…The illuminated light is coupled into a guided layer, diffracted horizontally in the plane by SAW, and then exited out of guided layer, forming a pixel image to a viewing plane. 2) Each pixel represents one object point of the 3D scene, which needs to be focused and flashed in real time to obtain video rate images. The angle of the light diffraction is determined by the wavelength (grating) of SAW radiating from the interdigital transducers (IDTs).…”

Section: Introductionmentioning

confidence: 99%

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Lee¹,

Fu²,

Lee³

2016

Jpn. J. Appl. Phys.

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We have developed acoustic-optic (AO) based display units for implementing a handheld hologram display by modulating light deflection through wide bandwidth surface acoustic wave (SAW). The developed AO device consists of a metal layer, a ZnS waveguide layer, SAW inter digital transducers (IDTs), and a screen for display. When RF power with a particular resonant frequency was applied to IDTs, SAW was radiated and interfered with confined beam propagating along ZnS waveguide layer. The AO interacted beam was deflected laterally toward a certain direction depending on Bragg diffraction condition, exited out of the waveguide layer and then directed to the viewing screen placed at a certain distance from the device to form a single pixel. The deflected angles was adjusted by modulating the center frequency of the SAW IDT (SAW grating), the RF power of SAW, and the angles between propagating light beam path along waveguide and radiating SAW. The diffraction efficiency was also characterized in terms of waveguide thickness, SAW RF input power, and aperture length. Coupling of mode (COM) modeling was fulfilled to find optimal device parameters prior to fabrication. All the parameters affecting the deflection angle and efficiency to form a pixel for a three-dimensional (3D) hologram image were characterized and then discussed.

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Acousto-Optic Modulator Driven by Surface Acoustic Waves

Cited by 15 publications

References 20 publications

Advances in lithium niobate photonics: development status and perspectives

Advances in lithium niobate photonics: development status and perspectives

Effective Light Beam Modulation by Chirp IDT on a Suspended LiNbO3 Membrane for 3D Holographic Displays

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

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