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Singh A, Huang HY, Chu YY, Hua CY, Lin SW, Fung HS, Shiu HW, Chang J, Li JH, Okamoto J, Chiu CC, Chang CH, Wu WB, Perng SY, Chung SC, Kao KY, Yeh SC, Chao HY, Chen JH, Huang DJ, Chen CT. Development of the Soft X-ray AGM-AGS RIXS beamline at the Taiwan Photon Source. J Synchrotron Radiat 2021; 28:977-986. [PMID: 33950006 PMCID: PMC8127366 DOI: 10.1107/s1600577521002897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 03/18/2021] [Indexed: 06/01/2023]
Abstract
We report on the development of a high-resolution and highly efficient beamline for soft X-ray resonant inelastic X-ray scattering (RIXS) located at the Taiwan Photon Source. This beamline adopts an optical design that uses an active grating monochromator (AGM) and an active grating spectrometer (AGS) to implement the energy compensation principle of grating dispersion. Active gratings are utilized to diminish defocus, coma and higher-order aberrations, as well as to decrease the slope errors caused by thermal deformation and optical polishing. The AGS is mounted on a rotatable granite platform to enable momentum-resolved RIXS measurements with scattering angles over a wide range. Several high-precision instruments developed in-house for this beamline are described briefly. The best energy resolution obtained from this AGM-AGS beamline was 12.4 meV at 530 eV, achieving a resolving power of 4.2 × 104, while the bandwidth of the incident soft X-rays was kept at 0.5 eV. To demonstrate the scientific impact of high-resolution RIXS, we present an example of momentum-resolved RIXS measurements on a high-temperature superconducting cuprate, i.e. La2-xSrxCuO4. The measurements reveal the A1g buckling phonons in superconducting cuprates, opening a new opportunity to investigate the coupling between these phonons and charge-density waves.
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Affiliation(s)
- A. Singh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. Y. Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Y. Y. Chu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. Y. Hua
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. W. Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. S. Fung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. W. Shiu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. H. Li
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - J. Okamoto
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. C. Chiu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. H. Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - W. B. Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. Y. Perng
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. C. Chung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - K. Y. Kao
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. C. Yeh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. Y. Chao
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. H. Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - D. J. Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - C. T. Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Wang B, Zhou Y, Guo Z, Wu X. Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model. Sensors (Basel) 2019; 19:E2569. [PMID: 31195714 DOI: 10.3390/s19112569] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/03/2019] [Accepted: 06/03/2019] [Indexed: 12/05/2022]
Abstract
The distributed feedback (DFB) laser is widely used in sensing because of its portable size, simple fabrication and high sensitivity. Most theoretical design models are based on passive Bragg gratings. However, passive grating models cannot be used to predict sensor performance using the important indicator of figure of merit (FOM) through theoretical calculations. To solve this problem, we replaced the passive grating with an active grating by using the imaginary part of the coupling constant that represents the value of the gain. As a comparison, the influence of the full width at half maximum (FWHM) and sensitivity were analyzed for different grating duty cycles and depths in the passive grating sensors. To obtain a higher FOM in the active grating sensors, we systematically investigated the effects of duty cycle and gain value through numerical simulations. We found that the redshift caused by a duty cycle increase can improve the sensitivity of biomolecule detection by 1.7 times.
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Lai CH, Fung HS, Wu WB, Huang HY, Fu HW, Lin SW, Huang SW, Chiu CC, Wang DJ, Huang LJ, Tseng TC, Chung SC, Chen CT, Huang DJ. Highly efficient beamline and spectrometer for inelastic soft X-ray scattering at high resolution. J Synchrotron Radiat 2014; 21:325-332. [PMID: 24562553 DOI: 10.1107/s1600577513030877] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 11/10/2013] [Indexed: 06/03/2023]
Abstract
The design, construction and commissioning of a beamline and spectrometer for inelastic soft X-ray scattering at high resolution in a highly efficient system are presented. Based on the energy-compensation principle of grating dispersion, the design of the monochromator-spectrometer system greatly enhances the efficiency of measurement of inelastic soft X-rays scattering. Comprising two bendable gratings, the set-up effectively diminishes the defocus and coma aberrations. At commissioning, this system showed results of spin-flip, d-d and charge-transfer excitations of NiO. These results are consistent with published results but exhibit improved spectral resolution and increased efficiency of measurement. The best energy resolution of the set-up in terms of full width at half-maximum is 108 meV at an incident photon energy tuned about the Ni L3-edge.
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Affiliation(s)
- C H Lai
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H S Fung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - W B Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H Y Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H W Fu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S W Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S W Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C C Chiu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - D J Wang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - L J Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - T C Tseng
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S C Chung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - D J Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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