公开(公告)号：US20240210576A1

公开(公告)日：2024-06-27

申请号：US18286808

申请日：2022-04-12

Applicant: Massachusetts Institute of Technology ,  Technion-Israel Institute Of Technology

Inventor： John Joannopoulos ,  Steven Johnson ,  Marin Soljacic ,  Steven Kooi ,  Justin Beroz ,  Ido Kaminer ,  Nicholas Rivera ,  Yi Yang ,  Charles Roques-Carmes ,  Ali Ghorashi ,  Zin Lin ,  Nicolas Romeo

IPC: G01T1/20 ,  G01N23/04 ,  G01N23/083 ,  G01N23/2251

CPC classification number: G01T1/2018 ,  G01N23/04 ,  G01N23/083 ,  G01N23/2251

Abstract: Methods and systems are disclosed that enhance the yield and speed of emission and control the spectral and angular emission of light emitted by materials under irradiation by high-energy particles through a process known as scintillation. In each case, a photonic structure (of nano- or micron-scale feature sizes) is integrated with a scintillating material, and the photonic structure enhances the yield or controls the spectrum of the material. Various embodiments of this technology and practical demonstrations are disclosed.

公开(公告)号：US20240385495A1

公开(公告)日：2024-11-21

申请号：US18288324

申请日：2022-04-25

Applicant: Massachusetts Institute of Technology

Inventor： Steven G. Johnson ,  Marin Soljacic ,  Charles Roques-Carmes ,  Yannick Salamin ,  Zin Lin

IPC: G02F1/35

Abstract: A system and method that may enable the generation of highly-efficient, high-power, narrow-linewidth, and tunable light sources from microwave frequencies to mid-infrared wavelengths is disclosed. The light source comprises a nonlinear medium coupled to a multi-modal cavity and a high-energy pump source. The nonlinear medium provides three-wave mixing between modes present in the cavity to generate, for example, terahertz waves. The broadband cavity enables cascading nonlinear processes. By engineering the Q-factors of the cavity's many modes, red-shifted (stokes) cascaded nonlinear processes strongly dominate over their blue-shifted (anti-stokes) counterparts, resulting in a quasi-complete depletion of the pump energy into the THz mode.

公开(公告)号：US20250137942A1

公开(公告)日：2025-05-01

申请号：US18701792

申请日：2022-08-16

Applicant: Massachusetts Institute of Technology

Inventor： Marin Soljacic ,  Charles Roques-Carmes ,  Nicholas Rivera ,  Zin Lin ,  William Li

IPC: G01N23/04 ,  B82Y20/00 ,  G01T1/20 ,  G21K4/00

Abstract: Several new techniques for designing nanophotonic scintillators which lead to optimal performance and novel functionalities. Important design concepts include the use of absorbing structures inspired by solar cells, angularly-selective structures, and metasurfaces. Scintillators based on conventionally overlooked materials (such as GaAs or GaN) are also disclosed, which are designed to reach efficiencies comparable or superior to state-of-the-art conventional scintillators (such as YAG:Ce and LYSO). Such scintillators provide important enhancement of scintillation yield arising from incorporation of nanophotonic patterns. Additionally, nanophotonic scintillators designed in conjunction with image post processing algorithms (such as deconvolution algorithms, tomographic reconstruction, etc.) are disclosed. These scintillators are designed in order to increase robustness, minimize the required dose/scan time or even the number of scans required in scintillation imaging. These new designs optimize the scintillator for optimal reconstruction.