QNP2 Two-Axis, Parallel Kinematic, XY Piezo Nanopositioning Stages


Design Features

  • Travels to 240 µm x 240 µm
  • Large square clear aperture up to 70 mm x 70 mm
  • Superior multi-axis accuracy via parallel-kinematic design
  • High stiffness and dynamics resulting in high process throughput
  • High-precision, frictionless flexure guidance
  • Patent pending design provides unmatched geometric performance
  • Long device lifetime
  • Superior positioning resolution and linearity with direct-metrology capacitive sensor option
  • Open-loop and vacuum versions

Aerotech’s QNP2 series XY, parallel-kinematic, piezo positioning stages combine sub-nanometer resolution, high dynamics, and excellent geometric performance in a compact, low-profile package. The QNP2-series piezo stages come standard with a large, clear aperture with closed-loop travels up to 200 µm x 200 µm (open-loop travels to 240 µm x 240 �m). The design is ideal for optical microscopy, scanning probe microscopy, x-ray transmission microscopy, or other inspection or manufacturing applications where two-sided part access is required.

Precision Parallel-Kinematic Design

The QNP2 piezo stages employ a parallel-kinematic flexure and metrology design that ensures the highest levels of multi-axis accuracy. Guided by precision flexures which are FEA-optimized to ensure high-stiffness and long device life, the QNP2 stages offer best-in-class stiffness and resonant frequency, enabling high process throughput and fast closed-loop response.  

Using a patent-pending drive design, yaw errors are minimized while still maintaining an Abbe-compliant metrology system.  This design results in unmatched positioning performance over the entire XY travel space.

Sub-Nanometer Performance

All QNP2 piezo stages are available with closed-loop feedback (-C) or open-loop (no feedback). The unique capacitive sensor parallel-metrology design measures the output of the positioning carriage, directly enabling sub-nanometer resolution, linearity errors below 0.01%, and single-digit nanometer repeatability.

Ultra-Precision Control

When coupled with Aerotech’s Q-series controllers and drives, the QNP2 stages demonstrate sub-nanometer positioning resolution, in-position stability (jitter), and high-positioning bandwidth. Software options such as Aerotech’s Dynamic Controls Toolbox and Motion Designer packages provide a host of advanced yet easy-to-use tools such as Learning Control, Harmonic Cancellation, and Command Shaping, providing improved tracking errors and faster step-and-settle times. OEM drive options are also available. Aerotech’s controller architecture easily enables high-speed, tightly-controlled coordinated motion between piezo stages, servos, steppers, and galvos.

Design Options

An optional mounting plate provides direct mounting to English or metric breadboard optical tables. A solid tabletop option is also available. QNP2 piezo stages are available in custom materials and vacuum-prepared versions upon request.

QNP Chart 1
QNP Chart 2
QNP Chart 3
QNP Chart 4
QNP2 Settle Chart


Mechanical Specifications

Closed-Loop Travel (X x Y) 30 μm x 30 μm 100 µm x 100 µm 200 µm x 200 µm
Open-Loop Travel, -30 to +150 V(1) 36 μm x 36 μm 120 µm x 120 µm 240 µm x 240 µm
Resolution(2) Closed-Loop 0.1 nm 0.30 nm 0.40 nm
Open-Loop 0.03 nm 0.15 nm 0.20 nm
Linearity(3,4) 0.02% 0.01% 0.01%
Bidirectional Repeatability(5) 4 nm 1 nm 1 nm
Straightness 25 nm 10 nm 10 nm
2D Flatness (Over Full XY Travel) 15 nm 5 nm 15 nm
Pitch 5 μrad (1 arc sec) 1.5 µrad (0.3 arc sec) 1.5 µrad (0.3 arc sec)
Yaw 5 μrad (1 arc sec) 12 µrad (2.5 arc sec) 20 urad (4 arc sec)
Stiffness (in direction of motion)(6) 33 N/μm 2.1 N/µm 1.7 N/µm
Unloaded Resonant Frequency(6) 2400 Hz 565 Hz 375 Hz
Resonant Frequency (200 gram load)(6) 1725 Hz 380 Hz 290 Hz
Max Payload(7) 1 kg 1 kg 3 kg
Maximum Acceleration (Unloaded)(8) 400 m/s2 170 m/s2 40 m/s2
Moving Mass (Unloaded) 0.14 kg 0.14 kg 0.5 kg
Stage Mass 0.36 kg 0.48 kg 1.2 kg
Material Anodized aluminum(9) Anodized aluminum(9) Anodized aluminum(9)
MTBF (Mean Time Between Failure) 30,000 hours 30,000 hours 30,000 hours
  1. Value ±10%.
  2. See Piezo Engineering reference section 4.2 for description of resolution.
  3. Certified with each stage (closed-loop feedback models only).
  4. Measured approximately 15 mm above the carriage by an external metrology device. See Piezo Engineering reference section 4.1 for description of linearity and accuracy specifications.
  5. Specified as a 1 sigma (standard deviation) value (closed-loop feedback models only). See Piezo Engineering reference section 4.3 for description of bidirectional repeatability.
  6. Values ±20%.
  7. On-axis loading listed.
  8. Max acceleration listed is the stage mechanical limitation. Achievable accleration is a function of amplifer selection and move parameters.
  9. External elements are anodized aluminum. Some stainless steel components are used in the internal construction. Other materials upon request.
  10. Specifications listed are per axis unless specified.

Electrical Specifications

Drive System Piezo Multi-Layer Stack Actuator
Feedback Closed Loop: Capacitive Sensor (-C)
Open Loop: None (-)
Maximum Voltage -30 V to +150 V
Piezo Stack Capacitance(1) 4.6 μF (per axis) 3.2 µF (per axis) 6.4 uF (per axis)
  1. Value ±20%

Recommended Controller

Ensemble Ensemble QLAB
Ensemble QDe
Ensemble QLe
Ensemble QL(1)
A3200 Ndrive QLe
Ndrive QL(1)
  1. Unless noted, the QLAB, QDe, or QLe drives are required to achieve the listed specifications. Contact Aerotech for specifications when used with the QL drives.


Ordering Information

QNP2-100XYA Two-Axis XYZ Piezo Nanopositioning Stage

QNP2-100XYA-030 QNP2 two-axis XY piezo nanopositioning stage, 30 μm x 30 μm closed-loop travel
QNP2-100XYA-100 QNP2 two-axis XY piezo nanopositioning stage, 100 µm x 100 µm closed-loop travel
QNP2-150XYA-200 QNP2 two-axis XY piezo nanopositioning stage, 200 µm x 200 µm closed-loop travel

Feedback (Optional)

-C Capacitance sensor feedback

Mounting Plate (Optional)

-MP Mounting plate for English and metric optical breadboard tables

Tabletop (Optional)

-TT1 Solid metric tabletop, covers aperture

Integration (Required)

Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.
-TAS Integration - Test as system
Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration.
-TAC Integration - Test as components
Testing and integration of individual items as discrete components that ship together. This is typically used for spare parts, replacement parts, or items that will not be used together. These components may or may not be part of a larger system.