Focusing electromagnetic radiation within a turbid medium using ultrasonic modulation
First Claim
1. A method for focusing electromagnetic radiation, comprising:
- vibrating a focus volume within a diffusion medium at a first acoustical frequency, fa, using a first focused acoustical wave;
vibrating the focus volume within the diffusion medium at a second acoustical frequency, fb, using a second acoustical wave;
irradiating the diffusion medium with electromagnetic radiation at a radiation frequency, fr; and
receiving diffused electromagnetic radiation scattered from the focus volume, including modulated electromagnetic radiation from the focus volume at a modulated frequency that is the radiation frequency, fr, shifted by a function of the first acoustical frequency, fa, and the second acoustical frequency, fb.
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Abstract
The present disclosure provides various systems and methods for focusing electromagnetic radiation (EMR) within a diffusion medium, such as a turbid medium. A diffusion medium is irradiated with EMR. The EMR may be modulated by an acoustical wave focused on a focus volume within the diffusion medium. The EMR may be modulated by a beat frequency or other function of multiple focused acoustical waves. The EMR may be modulated at a harmonic of a fundamental frequency of one or more acoustical waves. A filter may filter the emerging EMR to remove all but specifically modulated EMR scattered from the focus volume. The modulated EMR may be focused and/or used for various purposes, including imaging. In some embodiments, the modulated EMR may be reflected and/or amplified by a phase conjugating mirror. Furthermore, in some embodiments, acoustical phase conjugation may be used to focus an acoustical wave on a focus volume.
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Citations
30 Claims
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1. A method for focusing electromagnetic radiation, comprising:
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vibrating a focus volume within a diffusion medium at a first acoustical frequency, fa, using a first focused acoustical wave; vibrating the focus volume within the diffusion medium at a second acoustical frequency, fb, using a second acoustical wave; irradiating the diffusion medium with electromagnetic radiation at a radiation frequency, fr; and receiving diffused electromagnetic radiation scattered from the focus volume, including modulated electromagnetic radiation from the focus volume at a modulated frequency that is the radiation frequency, fr, shifted by a function of the first acoustical frequency, fa, and the second acoustical frequency, fb. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for focusing electromagnetic radiation, comprising:
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a first transducer configured to generate a first focused acoustical wave to vibrate a focus volume within a diffusion medium at a first acoustical frequency, fa; a second transducer configured to generate a second acoustical wave to vibrate the focus volume within the diffusion medium at a second acoustical frequency, fb; a light source configured to irradiate the diffusion medium with electromagnetic radiation at a radiation frequency, fr; and a receiver configured to receive diffused electromagnetic radiation scattered from the focus volume, including modulated electromagnetic radiation from the focus volume at a modulated frequency that is the radiation frequency, fr, shifted by a function of the first acoustical frequency, fa, and the second acoustical frequency, fb. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification