Визуализация при слабой освещенности

Визуализация при слабой освещенности

What is low-light-level imaging?

Low-light-level imaging in semiconductor microscopy applications is used to detect faint emissions. This technique is also called photon emission microscopy or electroluminescence imaging. In general, electroluminescence is the emission of photons due to electrical stimulation.

What is low-light-level imaging used for?

Photon emission microscopy is typically done with SWIR cameras. In the SWIR band it is a proven technique for fault localization in microelectronic failure analysis.

How to localize faults?

Faults are localized by using several different techniques to isolate the defective areas on a die in the failed units. This is a very critical step in microelectronics as it dramatically reduces the area required for analysis. The localized defect is then characterized with a view to further understand the failure mechanism.

What causes photon emission?

Photon emission can be caused by the following type of defects in the semiconductor material:

  1. Hot electrons or hot holes
  2. Chemical impurities
  3. Deep traps
  4. Physical defects

Photon emission from defects are generally associated with forward and reverse biased pn junctions, transistors in saturation or dielectric breakdown.

What do we offer?

We have specially designed the Cougar-640 for this application. This highly sensitive SWIR camera has a high resolution of 640 x 512 pixels and a 20 μm pixel pitch. Because of its LN2 cooling and specially designed SFD ROIC, the Cougar-640 reaches a read noise of  20 e- and a dark current of less than 20 e-/s. This allows the user to reach exposure times of several hours and makes the detection of the lowest light levels possible. 

Next to the Cougar-640, we also offer the Xeva-1.7-320 TE3 and Cheetah-640CL TE3 for low-light-level imaging. 

 

Какие особенности необходимы?

  • Высокая чувствительность
    Низкий уровень шума и низкий темновой ток имеют решающее значение для достижения наилучшего качества изображения в условиях слабой освещенности
  • Долгое время экспозиции
    Долгая экспозиция (до нескольких часов) необходима для обнаружения сигналов при слабой освещенности
  • Низкий шум считывания
    Низкий шум считывания означает высокую чувствительность к сигналам при низкой освещенности
  • Охлаждение TE (3-стуренчатое) или жидким азотом (LN2)
    Охлаждаемые КВИК-камеры имеют пониженный темновой ток, меньший уровень шума и более высокий динамический диапазон. Предлагаются камеры как с TE3-охлаждением, так и с LN2-охлаждением

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Документы

Указания по применению
Low-noise SWIR InGaAs camera accelerates Melanoma diagnosis Dutch researchers have used the Cougar-640 to develop a cutting-edge method to accelerate the diagnosis of melanoma

World's first InGaAs camera photon emission microscope

Xenics enabled Semicaps to realize the world's first InGaAs camera photon emission microscope in 2004. Since then Xenics and sInfraRed have supported us in our endeavors for better sensitivity and resolution in photon and thermal emission microscopy.

Chua Choon Meng, CEO Semicaps