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Gimbal-less Two Axis (Tip-Tilt) Micromirrors

Scanning two axis (tip-tilt) micromirror is an optical beam-steering (or 2D optical scanning) technology that can be used in many industries. There are several major benefits of the Mirrorcle Technologies Inc. tip-tilt mirror over competing products. Gimbal-less Two-Axis Scanning Micromirror Devices based on ARI-MEMS fabrication technology initially developed through research projects at the Adriatic Research Institute (ARI) in Berkeley, CA, provide ultra low-power and very fast optical beam scanning in two-axes. The devices deflect laser beams to optical scanning angles of up to 32 at high speeds in both axes. Compared to the large-scale galvanometer optical scanners, our devices require several orders of magnitude less driving power. Continuous full-speed operation of our electro-static actuators dissipates less than a few milliwatts of power.

MirrorcleTech devices are made entirely of single-crystal silicon, resulting in excellent repeatability and reliability. Flat, smooth mirrors are coated with a thin film with desired reflectivity. Larger mirrors can be bonded onto actuators for custom aperture sizes. Mirror sizes from 0.8mm to 4.2mm in diameter are currently available in stock. Sizes up to 9.0mm were successfully demonstrated in special applications.

MirrorcleTech's MEMS micromirror technology is highly versatile and adaptable to various applications. Some devices are fabricated with somewhat generic performance specifications. Other devices are highly customized to achieve specific set of specifications, such as e.g. VGA and SVGA type projection-display.

Key Benefits

  • The tilt angle is analog as opposed to on-off. See video of tip-tilt-piston movement under microscope.
    This is the key differentiation with digital micromirror elements which can not be used for arbitrary-direction optical beam steering. In other words, if a tilt angle of 6.15 is required, it is simply a matter of applying the correct voltage and that angle (or any other angle) can be obtained and maintained for any length of time with practically zero power consumption.
  • Point-To-Point Scanning
    The devices are designed and optimized for point-to-point optical beam scanning mode of operation.  A steady-state analog actuation voltage results in a steady-stage analog angle of rotation of the micromirror.  There is a one-to-one correspondence of voltages and angles that is highly repeatable. 
  • Modular Design
    In order to produce devices with a different mirror size, most technologies require not only a new fabrication cycle, but in some cases complete actuator redesign. At Mirrorcle Technologies we provide for the first time a MEMS based, customizable aperture size beam steering technology. Namely, sets of electrostatic actuators optimized for speed, angle, area footprint or resonant driving are designed and realized in a self-aligned silicon fabrication process. Metallized, ultra low-inertia single crystal mirrors made stiff and flat by a special design of silicon beams are created in a separate fabrication process. The diameter, as well as geometry of the mirror is selected by customer, in order to optimize the trade-offs between speed, beam size, and scan angle for each individual application. The mirrors are subsequently bonded to the actuators. 

    A variety of gibmal-less two-axis actuator designs are available. The actuators lend themselves inherently to a modular design approach. Each actuator can utilize rotators of arbitrary length, arbitrarily stiff linkages, and arbitrarily positioned mechanical rotation transformers. In stock categories include 4.2mm x 4.2mm die size, 4.7mm x 4.7mm die size, 7.0mm x 7.0mm die size, and 8.0mm x 8.0mm die size. In most cases, larger die size allows better performance due to increased electrostatic force. However for smaller mirror sizes smaller die are more optimal. Beyond die size other parameters are varied such as e.g. stiffness. Some devices are designed to operate at low voltages (>-8 to +8 of mechanical tilt at 100V,) exhibit the largest maximum scan angle while another series of devices operate at higher voltages and reach

-4 to +4 of mechanical tilt, and therefore provide correspondingly higher scanning speeds.

  • High Speed Point-To-Point Optical Beam Scanning
    The major advantage of our proprietary gimbal-less design is the capability to scan optical beams at equally high speeds in both axes. A typical device with a 0.8 mm diameter-sized micromirror achieves angular beam scanning of up to 500 rad/s and has first resonant frequency in both axes at approximately 4 kHz. Large angle step response settling times of <100 s have been demonstrated on devices with micromirrors up to 0.8 mm in diameter. Devices with 2.0mm diameter mirrors can achieve large angle step settling times of <1ms, etc.
  • Dynamic Mode Scanning
    Devices can also operate in the dynamic, resonant mode. In this mode, low actuation voltages at frequencies near resonance result in large bi-directional optical beam angles (e.g. -16 to 16).  Resonant frequencies are in the range from several kHz up to 21 kHz and higher for MEMS display applications. Resonance depends on the actuator type (series,) and the micromirror type and diameter that is assembled with the actuator.

Summary of Specifications

Description: Micromirror

Description: Micromirror2

Integrated Mirror Devices:

         Mirror Sizes: 0.8 mm, 1.2mm, 1.7mm, and 2.0mm diameter.

         Maximum tilt angle under point-to-point driving: -6 to +6 mechanical each axis, varies with design type.

         Maximum tilt angle under resonant driving: -7 to +7 mechanical

         See support page for examples


Bonded Mirror Devices:

         Bonded Mirror Sizes: 2.0, 2.4, 3.0, 3.2, 3.6, and 4.2mm diameter in stock, larger possible in special orders.

         Maximum tilt angle under point-to-point driving: -6 to +6 mechanical on each axis, varies with design type.

         Maximum tilt angle under resonant driving: -7 to +7 mechanical, varies with design type.

         See support page for many examples

Common Specifications for All Devices:

  • Surface Roughness: <10 nm rms
  • Drive voltage: 0 -140 Volts
  • Mirror Radius of Curvature: >5 m
  • Mirror Coating: Aluminum or Gold
  • Positional repeatability: better than 0.0005 (500 micro-degrees) at room temperature
  • Temperature operation: -40C to 120C
  • Optical power handling: up to 1W any mirror, any wavelength. Above 1W depends on mirror size, coating, and wavelength. E.g. 2W CW green laser demonstrated on a 2mm bonded mirror.
  • First resonant rotation frequency: >3 kHz for both axes for small mirror sizes, >1.2kHz for 2.0mm size, etc.

MirrorcleTech devices are highly customizable with several controllable trade-offs (mirror size vs. speed, angle vs. speed, die size vs. speed, die size vs. cost, etc.) Custom designs and fabrication is performed for larger orders or under NRE contracts.

Detailed Descriptions and More Information

Pricing

View price list (in PDF) of our off-the-shelf demonstration devices available in small quantities.
(Mirrorcle Technologies' Terms and Conditions of Sale apply.)

Please contact us for additional product details, custom device specifications, and large-quanity quotations.

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