Imaging device comprising spatial light modulator and imaging method thereof

An imaging apparatus comprising:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane to which output light from the light source is input, and configured to perform light amplitude modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light amplitude modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of an object irradiated with output light from the spatial light modulator;
• a photodetector configured to selectively receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value;
• and
• a control unit configured to control setting of the light amplitude modulation pattern on the modulation plane of the spatial light modulator and acquire a complex amplitude image of the object based on the light amplitude modulation pattern and the light intensity value, wherein
• the control unit is configured to:
• set a first region and a second region on the modulation plane of the spatial light modulator,
• in an image acquisition of the first region, sequentially set a plurality of light amplitude modulation patterns in the first region, and for each light amplitude modulation pattern, acquire the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in a region other than the first region uniformly to a non-zero predetermined value, acquire the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in the region other than the first region uniformly to zero, acquire the light intensity value by setting the light amplitude modulation in the first region uniformly to zero and setting the light amplitude modulation in the region other than the first region uniformly to the predetermined value, and acquire a complex amplitude image of a region of the object corresponding to the first region based on the acquired light intensity values and the light amplitude modulation pattern, and
• in an image acquisition of the second region, sequentially set a plurality of light amplitude modulation patterns in the second region, and for each light amplitude modulation pattern, acquire the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in a region other than the second region uniformly to a non-zero predetermined value, acquire the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in the region other than the second region uniformly to zero, acquire the light intensity value by setting the light amplitude modulation in the second region uniformly to zero and setting the light amplitude modulation in the region other than the second region uniformly to the predetermined value, and acquire a complex amplitude image of a region of the object corresponding to the second region based on the acquired light intensity values and the light amplitude modulation pattern.

An imaging method for imaging an object using:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane on which an image of the object irradiated with output light from the light source is formed, and configured to perform light amplitude modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light amplitude modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of output light from the spatial light modulator;
• and
• a photodetector configured to selectively receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value,
• the method comprising:
• a region setting step of setting a first region and a second region on the modulation plane of the spatial light modulator;
• a first region image acquisition step of sequentially setting a plurality of light amplitude modulation patterns in the first region, and for each light amplitude modulation pattern, acquiring the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in a region other than the first region uniformly to a non-zero predetermined value, acquiring the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in the region other than the first region uniformly to zero, acquiring the light intensity value by setting the light amplitude modulation in the first region uniformly to zero and setting the light amplitude modulation in the region other than the first region uniformly to the predetermined value, and acquiring a complex amplitude image of a region of the object corresponding to the first region based on the acquired light intensity values and the light amplitude modulation pattern;
• and
• a second region image acquisition step of sequentially setting a plurality of light amplitude modulation patterns in the second region, and for each light amplitude modulation pattern, acquiring the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in a region other than the second region uniformly to a non-zero predetermined value, acquiring the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in the region other than the second region uniformly to zero, acquiring the light intensity value by setting the light amplitude modulation in the second region uniformly to zero and setting the light amplitude modulation in the region other than the second region uniformly to the predetermined value, and acquiring a complex amplitude image of a region of the object corresponding to the second region based on the acquired light intensity values and the light amplitude modulation pattern.

An imaging method for imaging an object using:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane to which output light from the light source is input, and configured to perform light amplitude modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light amplitude modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of the object irradiated with output light from the spatial light modulator;
• and
• a photodetector configured to selectively receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value,
• the method comprising:
• a region setting step of setting a first region and a second region on the modulation plane of the spatial light modulator;
• a first region image acquisition step of sequentially setting a plurality of light amplitude modulation patterns in the first region, and for each light amplitude modulation pattern, acquiring the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in a region other than the first region uniformly to a non-zero predetermined value, acquiring the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in the region other than the first region uniformly to zero, acquiring the light intensity value by setting the light amplitude modulation in the first region uniformly to zero and setting the light amplitude modulation in the region other than the first region uniformly to the predetermined value, and acquiring a complex amplitude image of a region of the object corresponding to the first region based on the acquired light intensity values and the light amplitude modulation pattern;
• and
• a second region image acquisition step of sequentially setting a plurality of light amplitude modulation patterns in the second region, and for each light amplitude modulation pattern, acquiring the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in a region other than the second region uniformly to a non-zero predetermined value, acquiring the light intensity value by setting the light amplitude modulation pattern in the second region and setting the light amplitude modulation in the region other than the second region uniformly to zero, acquiring the light intensity value by setting the light amplitude modulation in the second region uniformly to zero and setting the light amplitude modulation in the region other than the second region uniformly to the predetermined value, and acquiring a complex amplitude image of a region of the object corresponding to the second region based on the acquired light intensity values and the light amplitude modulation pattern.