GEMINI-2D
INTERFEROMETER
2D electronic spectroscopy with patented TWINS technology
2D electronic spectroscopy made easy
NIREOS’ GEMINI-2D Interferometer turns your transient absorption spectrometer into a state-of-the-art two-dimensional electronic spectroscopy (2DES) setup.
At its core, the GEMINI-2D Interferometer features the patented TWINS (Translating-Wedge-Based Identical Pulses eNcoding System) design, making it a compact and ultra-stable interferometer. It uniquely generates two collinear and phase-locked replicas of your femtosecond laser pulses, delivering unrivaled stability and robustness for advanced ultrafast experiments.
Spectral range
Compact
Delay stability
Spectral Resolution
Clear Aperture
Look at more specifications
| VERSION | S | L |
|---|---|---|
| Spectral range | 400 nm – 2300 nm (Standard) 250 nm – 3500 nm (Ultra-broadband) | |
| Max. Delay @ 600 nm wavelength (Symmetric version) | from -400 fs to +400 fs | from -1050 fs to +1050 fs |
| Max. Delay @ 600 nm wavelength (Asymmetric version) | from -100 fs to +700 fs | from -100 fs to +2 ps |
| Delay Stability | < 1 attosecond | |
| Modes of operation | Step Scan (The user can select the dwell time for each delay via software) | |
| Dimensions | 180 mm × 180 mm × 90 mm | |
| Weight | 2 Kg | |
GEMINI-2D Working Principle
Understanding TWINS technology
At the heart of every NIREOS GEMINI-2D interferometer lies our groundbreaking, patented TWINS technology.
Developed over a decade ago at Politecnico di Milano, the TWINS interferometer design revolutionized compact Fourier Transform spectroscopy with its unique common-path geometry.
While commercially known as GEMINI-2D, this advanced system embodies the core principles of the original TWINS technology, ensuring exceptional stability, robustness against vibrations, and high accuracy in an ultra-compact form factor.
To delve deeper into the foundational research, explore the original publication on the TWINS birefringent interferometer by clicking here.
GEMINI-2D Interferometer main applications
Optional
Accessories
MF – SM adaptor
MF12×1 → SM1 (external thread) + SM05 (internal thread)
SM05 (internal thread)
MF – C adaptor
MF12×1 → C-mount (internal thread)
GM1 coupler
Tube Coupler, for optimal coupling between GEMINI interferometer and SPIDER photodetector
Scientific papers
The GEMINI-2D Interferometer is based on the TWINS (Translating-Wedge-Based Identical Pulses eNcoding System) design from the group of Prof. Giulio Cerullo at Politecnico di Milano (Italy), with a >10 years track record of top-notch scientific results published in high-impact international journals.
As the commercial embodiment of this cutting-edge TWINS interferometer technology, GEMINI-2D offers unparalleled performance for 2D electronic spectroscopy and other ultrafast applications.
Find out more details regarding our technology in these scientific publications:
Explore key research papers featuring the GEMINI-2D (or TWINS) interferometer
White Light Excited Two-Dimensional Fluorescence Excitation Spectroscopy: Picosecond Time-Resolved Excitation Emission Matrix, Tatsuya Yoshida, Kiyoshi Miyata, Ken Onda, J. Phys. Chem. Lett. 2026, 17, 6, 1588–1595
Fluorescence-Detected Pump–Probe Spectroscopy for Artifact-Free Detection of Stokes Shift Dynamics, H. Hao et al., J. Phys. Chem. Lett. 2025, 16, 20, 4861–4868
Two-Dimensional Electronic Spectroscopy Unravels sub-100 fs Electron and Hole Relaxation Dynamics in Cd-Chalcogenide Nanostructures, T. Stoll et al.,J. Phys. Chem. Lett. 2017, 8, 10, 2285–2290
Lévy Defects in Matrix-Immobilized J Aggregates: Tracing Intra-and Intersegmental Exciton Relaxation, L. Lüer et al., J. Phys. Chem. Lett. 2017, 8, 3, 547–552
Ultrafast carrier thermalization in lead iodide perovskite probed with two-dimensional electronic spectroscopy, J. M. Richter et al., Nature Communications 8, 376 (2017)
Tracking the coherent generation of polaron pairs in conjugated polymers, A. De Sio et al., Nature Communications 7, 13742 (2016)
NIREOS products are marketed and sold worldwide through our local offices and a global distribution network.
Any question?
What is the maximum allowed sensor size for the GEMINI-X?
Optimal compatibility with sensor with a maximum diagonal of 20 mm. For larger sensors, slight vignetting may happen. Contact us at info@nireos.com for further information.
Which sensors are compatible with GEMINI-X?
List of the implemented cameras:
- Basler: acA1920-155um, a2A1280-125umSWIR, a2A2048-110umSWIR
- IDS: UI306xCP-M
- NIT: WiDy SenS 640 V-ST
- Allied Vision: Goldeye G-034 XSWIR 2.2 TEC2, Goldeye G-130 VSWIR TEC1, Alvium 1800 U-812 UV, Alvium G1-234
- Opto Engineering: ITA13-GM-10C-SWIR
- Excelitas: pco.pixelfly 1.3 SWIR, pco.edge 9.4 bi CLHS
- XIMEA: MJ042MR-GP-P6-BSI
- Teledyne: 01-KINETIX-M-C
- Hamamatsu: ORCA-Quest C15550-20UP, ORCA-Quest 2 C15550-22UP, ORCA FUSION C14440-20UP
- Andor Technology: iXon Ultra 888 EMCCD
Is your camera not on the list? Contact us at info@nireos.com and let us know the exact model for more information.
Can GEMINI-X be paired with any sensor?
Yes, but it may require software integration. For more information, please contact NIREOS at info@nireos.com
Do you want to know more about GEMINI-2D and our other high tech solutions in Spectroscopy and Photonics?
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