Abstract: Provided is an ultrasensitive spectrometer. The ultrasensitive spectrometer includes a scattering medium, a light-receiving sensor disposed at a rear end of the scattering medium, a storage unit storing previously predicted speckle pattern information according to wavelengths with respect to the scattering medium, and a signal processing unit configured to process a sensing signal generated by the light-receiving sensor. The scattering medium scatters incident analyzing light to form a random speckle pattern, and the light-receiving sensor senses the speckle pattern formed by the scattering medium. The signal processing unit restores spectrum information of the analyzing light from sensing information sensed of the speckle pattern formed by the scattering medium.

Abstract: Provided are a hyperspectral image sensor and a hyperspectral imaging system including the hyperspectral image sensor. The hyperspectral image sensor includes a light-receiving sensor that is pixelated, and a plurality of metasurfaces that are arranged in front of the light-receiving sensor apart from each other in a stacking direction, and each have an array of meta-atoms. At least one of the plurality of metasurfaces is a random metasurface in which the meta-atoms are disorderly arranged, and a speckle pattern is formed on a sensing surface of the light-receiving sensor by the plurality of metasurfaces.

Abstract: Complex wavefront engineering is realized through a random metasurface phase mask backed by a phase-only spatial light modulator. The metasurface consists of an array of subwavelength nanoscatterers which give the metasurface a pre-arranged disorder. Since the transmission matrix of the disordered metasurface is known, there is no need for extensive characterization measurements which are instead required in standard disordered optical devices.

Abstract: Complex wavefront engineering is realized through a random metasurface phase mask backed by a phase-only spatial light modulator. The metasurface consists of an array of subwavelength nanoscatterers which give the metasurface a pre-arranged disorder. Since the transmission matrix of the disordered metasurface is known, there is no need for extensive characterization measurements which are instead required in standard disordered optical devices.

Abstract: A method for irradiating scattering medium, including modifying a particle's response to electromagnetic radiation irradiating the particle in a scattering medium, wherein the electromagnetic radiation is scattered by the scattering medium, and modulated by the modifying, into scattered electromagnetic radiation comprising a scattered field; forming a phase conjugate field, wherein the phase conjugate field is a phase conjugate of the scattered field; and irradiating the scattering medium with the phase conjugate field, wherein the phase conjugate field forms a focus at a target defined by the particle.

Abstract: A holographic characterization and playback apparatus is provided, which includes a light source, an optical path-forming optical system for separating the light emitted from the light source into a probe light and a reference light of different polarizations, and combining optical paths of the probe light and the reference light.

Abstract: A holographic characterization and playback apparatus is provided, which includes a light source, an optical path-forming optical system for separating the light emitted from the light source into a probe light and a reference light of different polarizations, and combining optical paths of the probe light and the reference light.

Abstract: A method for irradiating scattering medium, including modifying a particle's response to electromagnetic radiation irradiating the particle in a scattering medium, wherein the electromagnetic radiation is scattered by the scattering medium, and modulated by the modifying, into scattered electromagnetic radiation comprising a scattered field; forming a phase conjugate field, wherein the phase conjugate field is a phase conjugate of the scattered field; and irradiating the scattering medium with the phase conjugate field, wherein the phase conjugate field forms a focus at a target defined by the particle.