# US 11,994,671 B2 · Focusing device comprising a plurality of scatterers and beam scanner and scope device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,671 B2 - Document ID: US11994671B2 - Status: Granted - Kind: B2 - Application number: 17/874,004 - Filed: 2022-07-26 - Published: 2022-11-24 - Granted: 2024-05-28 - Earliest claimed: 2015-04-08 - Assignees: Samsung Electronics Co., Ltd.; California Institute of Technology - Applicants: Samsung Electronics Co., Ltd.; California Institute of Technology - Inventors: Amir Arbabi; Seunghoon Han; Andrei Faraon - Web page: https://patentgrep.com/patent/US11994671B2 ## CPC - G02B 5/1809: {with pitch less than or comparable to the wavelength} - G02B 27/0031: {for scanning purposes} - G02B 5/0263: {with positional variation of the diffusing properties, e.g. gradient or patterned diffuser} - G02B 5/0294: {adapted to provide an additional optical effect, e.g. anti-reflection or filter} - G02B 5/1876: {Diffractive Fresnel lenses; Zone plates; Kinoforms (G02B5/1842, G02B5/1847 take precedence; optical systems having diffractive correction means G02B27/0037; Fresnel lenses operating by refraction G02B3/08)} - G02B 5/188: {Plurality of such optical elements formed in or on a supporting substrate} - G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)} - G02B 23/00: Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices - G02B 27/0037: {with diffracting elements (G02B27/0056 takes precedence; holographic optical elements G02B5/32; zone systems G02B5/1876)} - G02B 27/005: {for correction of secondary colour or higher-order chromatic aberrations} - G02B 27/0927: {Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat} - G02B 27/0955: {Lenses (lenses per se G02B3/00)} - G02B 27/4216: {correcting geometrical aberrations} - G02B 27/4272: {having plural diffractive elements positioned sequentially along the optical path} - G02B 3/0087: {with index gradient} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A focusing device includes a substrate and a plurality of scatterers provided at both sides of the substrate. The scatterers on the both sides of the focusing device may correct geometric aberration, and thus, a field of view (FOV) of the focusing device may be widened. ## Claims ### Claim 1 An imaging device comprising: a focusing device; and an optical detector configured to detect light incident through the focusing device, wherein the focusing device comprises, a substrate; a first thin lens provided at a first surface of the substrate and comprising a plurality of first scatterers; and a second thin lens provided at a second surface of the substrate and comprising a plurality of second scatterers, wherein the plurality of first scatterers of the first thin lens are configured to correct geometric aberration of the second thin lens, and wherein the optical detector includes an optical detection layer configured to convert optical signal incident on the optical detection layer into electric signal. ### Claim 2 (depends on 1) The imaging device of claim 1, wherein the optical detection layer is provided on a focal plane of the focusing device. ### Claim 3 (depends on 1) The imaging device of claim 1, wherein the optical detection layer includes a plurality of charge-coupled devices (CCDs), complementary metal-oxide semiconductor (CMOS) sensors, or photo diodes. ### Claim 4 (depends on 1) The imaging device of claim 1, the optical detector includes a cover glass that protects the optical detection layer. ### Claim 5 (depends on 1) The imaging device of claim 1, wherein the first and the second thin lenses are configured so that light incident to the focusing device obliquely to an optical axis of the focusing device can be focused in a focusing point on a focal plane. ### Claim 6 (depends on 1) The imaging device of claim 1, wherein the first and the second thin lenses are configured to change a location of a focusing point on a focal plane, in which light incident to the focusing device obliquely to an optical axis of the focusing device is focused, according to an angle at which the light is incident on the first surface. ### Claim 7 (depends on 1) The imaging device of claim 1, wherein a phase shift of light that passes through the plurality of second scatterers decreases from a central area of the second thin lens to a peripheral area of the second thin lens. ### Claim 8 (depends on 7) The imaging device of claim 7, wherein a phase shift of light that passes through the plurality of first scatterers decreases from a peripheral area of the first thin lens to a middle area of the first thin lens and increases from the middle area of the first thin lens to a central area of the first thin lens. ### Claim 9 (depends on 1) The imaging device of claim 1, wherein the first and the second thin lenses of the focusing device are configured to allow light to form a focusing point on a focal plane. ### Claim 10 (depends on 9) The imaging device of claim 9, wherein the first and the second thin lenses are configured to change a location of the focusing point according to an angle at which the light is incident on the first surface. ### Claim 11 (depends on 10) The imaging device of claim 10, wherein the first and the second thin lenses area configured to determine the location of the focusing point according to Equation 1: h=f*tan θ wherein ‘h’ is a distance between the location of the focusing point and an optical axis of the focusing device, ‘f’ is an effective focal length of the focusing device, and ‘θ’ is an angle at which the light is incident on the first surface. ### Claim 12 (depends on 1) The imaging device of claim 1, wherein the plurality of first and the plurality of second scatterers are configured to allow incident light within a wavelength band to form a focusing point on a focal plane. ### Claim 13 (depends on 12) The imaging device of claim 12, wherein distances between the plurality of first scatterers and distances between the plurality of second scatterers are less than wavelengths in the wavelength band. ### Claim 14 (depends on 13) The imaging device of claim 13, wherein respective heights of the plurality of first scatterers and respective heights of the plurality of second scatterers are less than wavelengths in the wavelength band. ### Claim 15 (depends on 1) The imaging device of claim 1, wherein at least one of respective shapes of the plurality of first and the plurality of second scatterers and respective sizes of the plurality of first and the plurality of second scatterers changes according to a thickness of the substrate. ### Claim 16 An imaging device comprising: a focusing device; and an optical detector configured to detect light incident through the focusing device, wherein the focusing device comprises, a substrate; a first thin lens provided at a first surface of the substrate and comprising a plurality of first scatterers; and a second thin lens provided at a second surface of the substrate and comprising a plurality of second scatterers, wherein the first and the second thin lenses are configured so that light incident to the focusing device obliquely to an optical axis of the focusing device can be focused in a focusing point on a focal plane, and wherein the optical detector includes an optical detection layer configured to convert optical signal incident on the optical detection layer into electric signal. ### Claim 17 (depends on 16) The imaging device of claim 16, wherein a phase shift of light that passes through the plurality of second scatterers decreases from a central area of the second thin lens to a peripheral area of the second thin lens. ### Claim 18 (depends on 16) The imaging device of claim 16, wherein a phase shift of light that passes through the plurality of first scatterers decreases from a peripheral area of the first thin lens to a middle area of the first thin lens and increases from the middle area of the first thin lens to a central area of the first thin lens. ### Claim 19 (depends on 16) The imaging device of claim 16, wherein the plurality of first scatterers of the first thin lens are configured to correct geometric aberration of the second thin lens.