Research progresses towards mastering electromagnetic radiation in the tetra-Hertz (THz) region, specifically developing a ghost imaging method and applying it to surface plasmon-polariton microscopy of semiconductor materials. The main goal of the research is to develop a ghost imaging (GI) method for the THz region using free-electron laser radiation.

The project has achieved the set objectives of researching and progressing to master electromagnetic radiation in the tetrahertz (THz) region, specifically developing a ghost imaging method and applying it to surface plasmon-polariton microscopy. of semiconductor materials. The main objective of the research is to develop a ghost imaging (GI) method for the THz region using free-electron laser radiation. By doing the following.
  1) Implement the classical shadow imaging (GI) method using free-electron laser radiation as a thermal radiation pseudo-source;
2) develop a THz laser beam modulation method using speckle spot structures as random masks;
3) increase the resolution of the images obtained by the algorithmic GI shading rendering method using free-electron laser radiation and a transparent mask with many elements; 4) apply the GI method to surface THz plasmon microscopy of semiconductor materials;
5) Apply improved plasmon microscopy method to study biological samples on the surface of semiconductor materials.
The results were achieved as controlling the conductive surface using terahertz electromagnetic waves. The resolution of terahertz surface Plasmon resonance (SPP) microscopy has been enhanced by classical ghost imaging (GI) using free-electron laser radiation. Tested wide-field amplitude surface plasmon microscopy in the terahertz region.
In this task, the project implementation team also completely mastered the fabrication of photonic crystal structures which are monolayer films of tightly packed polystyrene particles with diameters in the range of 200-800 nm on silicon substrates and substrates. glass. At the same time, by investigating the transmittance properties of these structures, we see that we can completely determine the particle sizes if the membrane is in a tightly packed monolayer and vice versa using optical methods. This result also allows us to choose the appropriate particle size for the tetrahertz source and detector.
Research and identify molecules that can be used to attach to fabricated membrane structures to specifically identify TNT explosive molecules.
At the same time, the task allows the research team to carry out the fabrication of periodic structures using photolithography and dry etching methods. Thereby we know the strengths of each method for the designed structures.

The biggest contribution of this project is training human resources to develop new research directions on Tetrahertz at the Institute of Physics, Vietnam Academy of Science and Technology.

- Publications:
1. Nguyễn Văn Tiến, Nghiêm Thị Hà Liên, Nguyễn Trọng Nghĩa, Vũ Dương, Dương Chí Dũng, Nguyễn Minh Huệ, “ Đế SERS cấu trúc màng kim loại phủ trên màng đơn lớp xếp chặt hạt nano polystyrene” Advances in Optics, Photonics, Spectroscopy & Applications XI, 2021, p174-178, ISBN: 978-604-9988-20-2. 
2. I. Sh. Khasanov, B. A. Knyazev, A. K. Nikitin, V. V. Gerasimov, L. A. Zykova, and T. T. Trang “Enhancing resolution of terahertz surface plasmon resonance microscopy by classical ghost imaging using free electron laser radiation”, AIP Conference Proceedings 2299, 030008 (2020); https://doi.org/10.1063/5.0030496.
3. A K Nikitin, V V Gerasimov, B A Knyazev, N T H Lien and T T Trang, ‘Control of the conducting surface by terahertz surface electromagnetic waves’ Journal of Physics: Conference Series 1636 (2020) 012036, doi:10.1088/1742-6596/1636/1/012036.
4. Vasiliy Valerievich Gerasimov, Oleg Eduardovich Kameshkov, Alexey Konstantinovich Nikitin, Ildus Shev ketovich Khasanov, Alexey Georgievich Lemzyakov, Irina Veniaminovna Antonova, Artem Ilyich Ivanov,  Nghiem Thi Ha Lien, Nguyen Trong Nghia, Le Tu Anh, Nguyen Quoc Hung and Ta Thu Trang,  “First experimental demonstration of the wide-field amplitude surface plasmon microscopy in the terahertz range” Photonics 2023, 10(7), 723; https://doi.org/10.3390/photonics10070723.
-Other products: supervised for 01 PhD student.

Initially collaborating with Russian partners, the results of this research have the characteristic of exploring the Tetrahertz spectrum region, which has not received much attention by researchers. The Institute of Physics began to pay attention to the research, and initially invested in important equipment in research, manufacturing and surveying the physical characteristics in this spectral region. In the future, this cooperation should be maintained and expanded so that we can learn, exchange, and facilitate the development of this direction in Vietnam.