CN1862272A - Detecting wavelength adjustable terahertz photoelectric detector - Google Patents
Detecting wavelength adjustable terahertz photoelectric detector Download PDFInfo
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- CN1862272A CN1862272A CN 200610025716 CN200610025716A CN1862272A CN 1862272 A CN1862272 A CN 1862272A CN 200610025716 CN200610025716 CN 200610025716 CN 200610025716 A CN200610025716 A CN 200610025716A CN 1862272 A CN1862272 A CN 1862272A
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Abstract
The present invention discloses a terahertz photodetector whose detection wavelength can be regulated. Said detector is formed from multiquantum trap chip and superconducting magnet system. Said THz photodetector possesses multiquantum trap structure, and uses external magnetic field as tuning measure to regulate detection frequency.
Description
Technical field
The present invention relates to Terahertz (THz) photodetector, specifically be meant a kind of THz photodetector of surveying the multi-quantum pit structure of wavelength-tunable.
Background technology
The investigative range of quantum well detector has been developed into contains the THz wave band, is just becoming a kind of important novel semi-conductor THz detector.This detector can be regulated its structure with controllable growing method, changes key parameters such as detection efficiency and frequency, satisfies different actual needs, realizes the purpose of so-called artificial cutting.But the THz detector of this structure is still keeping the shortcoming that is determined on some principles of quantum trap infrared detector (QWIP), mainly contains the following aspects: 1) by the sub-band transition in the detector of transition rule decision grating coupling or 45 degree angle lap couplings must be arranged; 2) responsiveness that cause is little by the carrier lifetime of the compound decision of intersubband in the band of conduction band or valence band is short; 3) because the noise that the thermal effect of fermi-distribution characteristic decision causes is big etc.; 4) the detector look-in frequency of being determined by the quantum confinement principle can not be regulated, and perhaps regulates very difficult.To the improvement of these shortcomings be this structure type THz detector of development the problem that must face.
Know that under the situation that the structure of quantum well does not change, the energy level of charge carrier in the trap can be moved and divide under the effect of externally-applied magnetic field.Mobile and the division of charge carrier energy level means the change of resonance incident light frequency and the change that absorbs the incident light probability.Absorption between the energy level that is caused by magnetic field does not have specific (special) requirements to the incident direction of light.In addition, the introducing of externally-applied magnetic field makes whole quantum well structure form the class quantum-dot structure under the action of a magnetic field.Quantum-dot structure has three-dimensional quantum limitation effect to charge carrier wherein, the density of states feature that will cause a split and the high separation of energy level.Because this characteristic, semiconductor-quantum-point has very wide application prospect at aspects such as single-electron device, memory and various photoelectric devices.Therefore use externally-applied magnetic field, in the technology of preparing of developing THz detector, the performance of detector is carried out tuning optimization, can overcome some major defects of QWIP and expand the investigative range of this detector and in the application of many aspects in conjunction with just.
Summary of the invention
Based on above-mentioned existing situation, purpose of the present invention is exactly to propose a kind of Multiple Quantum Well THz photodetector that externally-applied magnetic field is regulated look-in frequency of using.
Terahertz photoelectric detector of the present invention comprises: Multiple Quantum Well chip and superconducting magnet system.
The Multiple Quantum Well chip is made up of the Si Doped GaAs lower electrode layer 2 that is arranged in order growth on the semi-insulated GaAs substrate 1, multiple quantum well layer 3, AlGaAs barrier layer 4, Si Doped GaAs upper electrode layer 5 that the AlGaAs potential barrier/the GaAs potential well is formed.
Superconducting magnet system comprises: computing machine 6, and Current Control case 7, shell 8 and the interlayer that constitutes between the interior dawn 9 are liquid helium bath 10, are marked with liquid helium in the liquid helium bath, superconducting coil 11 is put in liquid helium bath.In the interior dawn is temperature-changing chamber 12, and Multiple Quantum Well chip 13 is positioned at the temperature-changing chamber bottom.The THz ripple that is detected incides on the Multiple Quantum Well chip by the waveguide in the temperature-changing chamber 14.The size of superconducting coil current is by computing machine, the control of Current Control case.By regulating the size of electric current in the superconducting coil, can be implemented in the continuous tuning of 0-12T scope internal magnetic field.Regulate the electric current in the superconducting magnet coil, just changed the size of THz detector surrounding magnetic field, also just realized the THz detector is surveyed the tuning of wavelength, when the response wave length of detector is consistent with the THz wavelength that is detected, the circuit that is connected with detector obtains maximum electric signal, this signal by the computer system that is connected with detector record.
Device principle of work of the present invention is: the Multiple Quantum Well chip is under the action of a magnetic field, and i Landau level in the quantum well after the division of charge carrier ground state is:
Wherein
E is an electron charge, and B is a magnetic field intensity, m
*It is electron effective mass.The probing wave peak position energy of detector is E=h ω
c, corresponding explorer response frequency is ω
c, it becomes with magnetic field B and becomes big greatly, works as B=B
cThe time, E
0,1Equate with barrier energy that just in time this moment, detector began response is arranged, B＜B
cThe time do not have a response, B＞B
cThe time response arranged.So just realized detector being carried out the adjusting of look-in frequency by magnetic field.
The present invention has following good effect and advantage:
1. be different from the sub-band transition in the n-QWIP detector, grating coupling or 45 degree angle lap couplings need not be arranged.Transition between the Landau level has overcome the shortcoming that causes on the n-QWIP device principle to absorb under the normal incidence condition.Overcome normal incidence on the QWIP principle simultaneously and can not induce the shortcoming of photoelectricity transition, improved the responsiveness of detector greatly, reduced dark current, and finally improved the detectivity of detector.
2. make whole multi-quantum pit structure under the action of a magnetic field, form the class quantum-dot structure behind the adding magnetic field, promptly be that material can be with the restriction of gesture on the z direction, and the magnetic confinement gesture that on the x-y plane, has magnetic field to cause, thereby make the energy state density of structure develop into discrete line feature from the step under the two dimensional constraint with δ feature, thereby hot auxiliary dark current and phonon scattering probability have been suppressed widely, can increase the photo-generated carrier life-span, improve the responsiveness of detector, reduce dark current, and finally improve the detectivity of detector.
Description of drawings
Fig. 1 is the structural representation sketch of THz photodetector of the present invention.
Fig. 2 is the structural representation sketch of Multiple Quantum Well chip.
Embodiment
Below in conjunction with drawings and Examples the specific embodiment of the present invention is described in further detail:
Multiple Quantum Well chip of the present invention is the typical technology that utilizes epitaxial growth of semiconductor material, and as molecular beam epitaxy technique, the metal organic chemical vapor deposition technology is arranged in order growth on semi-insulated GaAs substrate:
Thickness is the GaAs lower electrode layer that the Si of 800nm mixes;
Alternating growth 30 or 50 cycles by the AlGaAs potential barrier the multiple quantum well layer formed of GaAs potential well;
The AlGaAs barrier layer that 20nm is thick;
Thickness is the GaAs upper electrode layer that the Si of 400nm mixes.
Al in the multiple quantum well layer
xGa
1-xThe height of As barrier layer, x regulates by the Al component.The height of potential barrier has determined the size of detector observable THz wavelength in zero magnetic field with the thickness of GaAs potential well layer.
The used superconducting magnet system of the present invention is that Oxford Instruments Limited produces, and model is S11/12L-40-13.The Multiple Quantum Well chip is positioned at the bottom of the temperature-changing chamber of this system.Directly do not hold liquid helium in the temperature-changing chamber, but heat interchange is arranged, so the low-temperature working environment of Multiple Quantum Well chip does not need extra refrigeration system with liquid helium bath.The THz ripple that is detected incides on the Multiple Quantum Well chip in the temperature-changing chamber by waveguide, is surveyed by the Multiple Quantum Well chip.Regulate the electric current in the superconducting magnet coil, just changed the size of Multiple Quantum Well chip surrounding magnetic field, also just realized the THz detector is surveyed the tuning of wavelength, when the response wave length of detector is consistent with the THz wavelength that is detected, the circuit that is connected with detector obtains maximum electric signal, this signal by the computer system that is connected with detector record.
Wide at the GaAs trap is 50 , Al
xGa
1-xThe As barrier height is 30meV, the effective mass m of electronics in the potential well
*Under the 0.067m0 condition, the ground state level of electronics is 23.0meV.Under the effect of externally-applied magnetic field, the ground state division, the division size is
Still in potential well, the position of first Landau level changes with magnetic field the 0th Landau level that splits off, when changes of magnetic field to a critical value B
cThe time, first Landau level can be higher than barrier height, and the electronics of absorption resonance frequency incident light can be dispersed on the transportable expansion attitude and form photocurrent in the potential well, thereby realizes the detection of detector.Critical magnetic field B as can be known as calculated
c=4.05T, the energy of observable THz ripple is greater than 7.0meV.When magnetic field from B
cBeginning, when increasing to 12T continuously, the wave band that the THz detector can detect will increase continuously 20.7meV from 7.0meV, thereby realize magnetic field tuning to detector detection wavelength.Because maximum value of magnetic field is 12T in the Highfield SolenoidSystem superconducting magnet system of Oxford Instruments Limited, so the THz ceiling capacity that is detected is 20.7meV.This restriction will be resolved in bigger magnetic field, thereby realize survey wavelength tuning at whole THz wave band.
Change the width and the Al of GaAs quantum well
xGa
1-xThe As barrier height, critical magnetic field B
cSize and observable THz frequency also will change thereupon, can satisfy of the adjusting of the more different magnetic field that requires to the look-in frequency size of THz detector.The size of the longest observable THz wavelength and magnetic field critical value is listed in the following table 1 in the lump under different potential well width and the barrier height, as more general example.
Table 1
| Trap wide () | Barrier height (meV) | Ground state (meV) | Bc(T) | THz wave band (meV) |
| 50 | 30 | 23.0 | 4.05 | 7.0 |
| 100 | 30 | 14.6 | 8.91 | 15.4 |
| 50 | 20 | 16.6 | 1.97 | 3.4 |
| 100 | 20 | 11.5 | 4.92 | 8.5 |
Claims (1)
1. a terahertz photoelectric detector of surveying wavelength-tunable is characterized in that comprising: Multiple Quantum Well chip and superconducting magnet system;
The Multiple Quantum Well chip is made up of the Si Doped GaAs lower electrode layer (2) that is arranged in order growth on the semi-insulated GaAs substrate (1), multiple quantum well layer (3), AlGaAs barrier layer (4), Si Doped GaAs upper electrode layer (5) that the AlGaAs potential barrier/the GaAs potential well is formed;
Superconducting magnet system comprises: computing machine (6), and Current Control case (7), shell (8) and the interlayer that constitutes between the interior dawn (9) they are liquid helium bath (10), are marked with liquid helium in the liquid helium bath, superconducting coil (11) is put in liquid helium bath; In the interior dawn is temperature-changing chamber (12), and Multiple Quantum Well chip (13) is positioned at the temperature-changing chamber bottom; The THz incident light that is detected incides on the Multiple Quantum Well chip by the waveguide in the temperature-changing chamber (14); The size of superconducting coil current is by computing machine, the control of Current Control case; By regulating the size of electric current in the superconducting coil, change the size of Multiple Quantum Well chip surrounding magnetic field, and then realize the THz detector is surveyed the tuning of wavelength.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834227A (en) * | 2010-04-27 | 2010-09-15 | 中国科学院上海微系统与信息技术研究所 | Optimization method of response ratio of one-dimensional T-Hz quantum well photoelectric detector |
| CN102288299A (en) * | 2011-07-25 | 2011-12-21 | 中国科学院上海微系统与信息技术研究所 | Terahertz quantum well photodetector (THzQWP)-based passive thermal imaging detection system and method thereof |
| CN103107230A (en) * | 2011-11-14 | 2013-05-15 | 常州光电技术研究所 | Quantum well terahertz detector |
| CN103346196A (en) * | 2013-06-24 | 2013-10-09 | 华中科技大学 | Terahertz detector of multiple quantum well structure with tunable wavelength |
| CN104410463A (en) * | 2014-11-25 | 2015-03-11 | 中国航天科技集团公司第五研究院第五一三研究所 | Method and system for laser communication on basis of quantum cascade laser |
| CN105244391A (en) * | 2015-11-09 | 2016-01-13 | 中国科学院上海微系统与信息技术研究所 | Wide-response-spectrum terahertz quantum well photoelectric detector and manufacturing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176463B (en) * | 2010-12-21 | 2012-12-12 | 上海电机学院 | Terahertz photon on chip control system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6815708B1 (en) * | 1999-08-16 | 2004-11-09 | Japan Science And Technology Agency | Optical superconducting device |
| AU2003234273A1 (en) * | 2002-04-26 | 2003-11-10 | The University Of Connecticut Center Of Science And Technology Commercialization | THz DETECTION EMPLOYING MODULATION DOPED QUANTUM WELL DEVICE STRUCTURES |
| CN1290238C (en) * | 2004-02-26 | 2006-12-13 | 中国科学院上海技术物理研究所 | Quantum pit terahertz multiband integrated coherent light soure chip and prepaaration method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834227A (en) * | 2010-04-27 | 2010-09-15 | 中国科学院上海微系统与信息技术研究所 | Optimization method of response ratio of one-dimensional T-Hz quantum well photoelectric detector |
| CN102288299A (en) * | 2011-07-25 | 2011-12-21 | 中国科学院上海微系统与信息技术研究所 | Terahertz quantum well photodetector (THzQWP)-based passive thermal imaging detection system and method thereof |
| CN103107230A (en) * | 2011-11-14 | 2013-05-15 | 常州光电技术研究所 | Quantum well terahertz detector |
| CN103107230B (en) * | 2011-11-14 | 2015-09-16 | 常州光电技术研究所 | A kind of Quantum Well Terahertz detector |
| CN103346196A (en) * | 2013-06-24 | 2013-10-09 | 华中科技大学 | Terahertz detector of multiple quantum well structure with tunable wavelength |
| CN104410463A (en) * | 2014-11-25 | 2015-03-11 | 中国航天科技集团公司第五研究院第五一三研究所 | Method and system for laser communication on basis of quantum cascade laser |
| CN105244391A (en) * | 2015-11-09 | 2016-01-13 | 中国科学院上海微系统与信息技术研究所 | Wide-response-spectrum terahertz quantum well photoelectric detector and manufacturing method thereof |
| CN105244391B (en) * | 2015-11-09 | 2017-04-19 | 中国科学院上海微系统与信息技术研究所 | Wide-response-spectrum terahertz quantum well photoelectric detector and manufacturing method thereof |
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