Multi-axis, large tilt angle, wafer level micromirror array for large scale beam steering applications

• US 8,760,743 B2
• Filed: 09/13/2013
• Issued: 06/24/2014
• Est. Priority Date: 04/08/2008
• Status: Active Grant

• Current Assignee: Cornell University
• Original Assignee: Cornell University
• Inventors: Lal, Amit, Ardanuc, Serhan M.
• Primary Examiner(s): CHERRY, EUNCHA P
• Application Number:
  US14/026,468
• Publication Number:
  US 20140078568A1
• Time in Patent Office: 284 Days
• Field of Search: 359/198.1, 359/853, 359/872, 126/684, 126/685, 126/687
• US Class Current: 359/198.1
• CPC Class Codes: B81B 2201/042 Micromirrors, not used as optical switches
• CPC Class Codes: B81B 2203/058 Rotation out of a plane parallel to the substrate
• CPC Class Codes: B81B 3/0054 For holding or placing an element in a given position
• CPC Class Codes: F24S 2023/85 Micro-reflectors
• CPC Class Codes: F24S 23/80 having discontinuous faces
• CPC Class Codes: F24S 30/452 Vertical primary axis
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: G02B 7/182 for mirrors
• CPC Class Codes: G02B 7/1821 for rotating or oscillating mirrors
• CPC Class Codes: H01L 31/0543 comprising light concentrating means of the refractive type, e.g. lenses
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: Y02E 10/47 Mountings or tracking
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

A system 120 for reflecting or redirecting incident light, microwave or sound energy includes a first substrate 144 configured to support an array of reflective elements 130 that can be angularly displaced through a range of substantially 90 degrees in response to a reflector angle control signal and a controller programmed to generate the reflector angle control signal to achieve desired incident energy beam or wavefront re-direction. The reflective elements 130 preferably comprise MEMS micro-reflector elements hingedly or movably attached to the first substrate 130 and define a reflective surface that is aimed at the source of incident light, microwave or sound energy.

Claims

1. A system for reflecting or redirecting incident energy, comprising:

a first substrate having a surface;

an array of energy reflecting elements disposed on the surface of the first substrate, wherein each energy reflecting element is controllably positionable through a reflector angle from between zero degrees to 90 degrees with respect to the substrate surface in response to a reflector angle control signal;

a second substrate on or in which the first substrate is controllably, azimuthally-rotatably disposed; and

at least one controller coupled to the system that provides at least one of a reflector angle control signal to at least one of the energy reflecting elements and an azimuth angle control signal to the second substrate,

wherein the system is steerable in two dimensions,

further wherein the system is in a power-consuming mode when changing at least one of the reflecting element angles and the second substrate azimuth angle, and in an idle mode when the reflecting elements and the second substrate are stationary.

2. The system of claim 1, wherein when the reflector angle is zero degrees, the respective energy reflecting element is disposed substantially flat against the surface of the first substrate.

3. The system of claim 1, wherein when the reflector angle is 90 degrees, the respective energy reflecting element is disposed substantially perpendicular to the surface of the first substrate.

4. The system of claim 1, wherein each energy reflecting element has a size scale from between a sub-micron scale to a meter scale.

5. The system of claim 1, wherein the array of energy reflecting elements further comprises one or more latching mechanisms coupled between the array of energy reflecting elements and the first substrate,

wherein the one or more latching mechanisms includes a central hinge positioned between a proximal edge and a distal edge of a reflecting element, said central hinge being configured to hingedly retain a tail member having a hinge end opposite a movable base,

further wherein the first substrate includes a slider rail region for each reflecting element tail member, said slider region being configured to slidably receive, engage and support said reflecting element tail member in one of a selected plurality of tail member positions, such that each reflecting element tail member position within said substrate'"'"'s slider region corresponds with a defined reflecting element angular displacement.

6. The system of claim 1, wherein the array of energy reflecting elements further comprises one or more latching mechanisms coupled between the array of energy reflecting elements and the first substrate,

wherein the one or more latching mechanisms includes a pivotal support strut connected at one region thereof to a reflecting element and at another region thereof to an actuator mechanism.

7. The system of claim 1, wherein the array of energy reflecting elements further comprises one or more latching mechanisms coupled between the array of latchable, energy reflecting elements and at least one of the first substrate,

wherein the one or more latching mechanisms includes a compliant mechanism.

8. The system of claim 1, wherein the at least one controller is wirelessly coupled to the system.

9. The system of claim 7, further comprising a latching mechanism coupled to the second substrate.