Nano Electronic Materials Research Group
Low Temperature Nano-scale Imaging and Spectroscopy system is designed to explore the novel opto-electronic properties of semiconductor nanostructres with high spatial, spectral and temporal resolutions.
The system is based on a conventional microscope with long working distance objectives. However, the novel techniques developed by our group provide capabilities of isolating the spectral features of individual light emitting units such as quantum dots with nano-meter scale precision. This simple optical imaging system has high signal collection efficiency as well as the flexibility to be combined with sophisticated ultra-fast spectroscopy techniques.
Major Equipment
- Home built Microscope with Mitutoyo 50x and 100xNIR objectives
- Cryostats
- Oxford Instruments' Microstat: Hi Res and Microstat
- Temperature Range: 4-350K
- Low thermal drift and high temperature stability
- ARS Cryo closed-cycle He cryostat
- Base temperature 7K
- no He consuption
- Continuous operation for days
- Detectors
- Roper Scientific 1340x100 LN cooled Back Illuminated CCD
- Spectral Response: 250-1100nm.
- Roper Scientific 512x1 LN cooled InGaAs Linear Diode Array
- Spectral Response: 800-1650nm.
- Perkin&Elmer Avalance Photo Diodes
- Spectral Response: 300-1100nm.
- Temporal Response: ~350ps
- Picoquant timeharp200 time counting electronics
- Resolution ~200 ps
- 40 ps time bins
- Spectrographs
- Acton 0.5m triple grating imaging spectrograph.
- Spectral Resolution: 0.05nm.
- Acton 0.3m triple grating imaging spectrograph.
- Spectral Resolution: 0.1nm.
- Excitation Sources
- Spectra-Physics Diode pumped ps/fs Ti:Sapphire Laser.
- Pulse width: <100fs / 5-10ps
- Tuning Range: 690-1000nm
- Super Optronic Super Trippler
- Tunability: 233-500nm
- New Focus Velocity diode laser system
- mode-hop free tuning range
- 20 nm tuning range around 920 nm
- Others
- Femtochrome FM 103 Auto-correlator.
- Home built interferometer with pico second (coarse) and sub femto second (fine) control.
- Home built Fabry-Perot interferometers
- Home built micro and nano positioners and controllers for alignment in vacuum and/or at low temperature
Nano Electronic Material Research Group
